Is www.isosklo.cz safe?

The scan of www.isosklo.cz on 13 Aug 2026 reached no verdict either way (score -12). Too little was captured to judge it, which is an unknown rather than a pass.

How was www.isosklo.cz checked?

A static pass resolved DNS, captured TLS and headers and followed the redirect chain, and where the standard tier allows, a headless browser rendered the page and recorded every request. Egress is SSRF-locked. Signatures that matched only page text are weighted far below one that matched a served file, because a page documenting malware matches the same rules.

www.isosklo.cz - URL scan, 13 Aug 2026

MalwareAnalyzer by Cyble scanned www.isosklo.cz and returned a unknown verdict (score -12). The page resolved to 81.91.86.11 on WEB4U - network in CZ. 4 domains and 1 IP were contacted, over 3 HTTP requests. The request followed 1 redirect before landing. This is a point-in-time observation from 13 Aug 2026; the page may have changed since.

Scan result

Verdict: unknown (score -12) · Confidence 15%
Scanned URL: https://isosklo.cz/uploads/9691399676.pdf
Domain: www.isosklo.cz · IP: 81.91.86.11 · AS39790 · CZ
Server: openresty
Page title: Isosklo - Chyba-404
HTTP status: 404 · text/html; charset=utf-8
TLS issuer: C=US, O=Let's Encrypt, CN=YR2 · valid to Sep 14 01: · subject CN=isosklo.cz
HTTP requests captured: 3
Scan tier: standard · observed 2026-08-13 02:09:55 UTC

Redirect chain

https://isosklo.cz/uploads/9691399676.pdf
https://www.isosklo.cz/uploads/9691399676.pdf

Antivirus & YARA (0 of 44 engines)

No engine flagged this page's content.

Why this verdict

Valid TLS, no impersonation or off-origin credential post

Detected technologies

Google Analytics
jQuery

Contacted infrastructure

81.91.86.11 - AS39790 WEB4U - network (Czechia)

Observed indicators

www.isosklo.cz
www.isotherm.cz
www.generalcompact.cz
www.inwebio.cz
81.91.86.11
https://www.isosklo.cz/uploads/9691399676.pdf
https://www.isosklo.cz/
https://www.isosklo.cz/uploads/css/main.css
https://www.isosklo.cz/uploads/js/lightbox/css/jquery.lightbox-0.5.css
https://www.isosklo.cz/uploads/js/jquery/jquery-1.4.1.min.js
https://www.isosklo.cz/uploads/js/lightbox/jquery.lightbox-0.5.min.js
https://www.isosklo.cz/uploads/js/public_functions.js
https://www.isosklo.cz/uploads/uvod.html
https://www.isosklo.cz/uploads/nase-produkty.html
https://www.isosklo.cz/uploads/novinky.html
https://www.isosklo.cz/uploads/reference.html
https://www.isosklo.cz/uploads/video.html
https://www.isosklo.cz/uploads/dokumenty.html
https://www.isosklo.cz/uploads/kontakty.html
https://www.isosklo.cz/uploads/images/ico_home.gif

Other scans of www.isosklo.cz (4)

This host has been scanned before. Each scan is a separate observation, so a verdict here does not carry over to the others.

20 Aug 2026 - unknown · https://www.isosklo.cz/uploads/13541473921.pdf
19 Aug 2026 - unknown · https://www.isosklo.cz/uploads/zolabavalema.pdf
13 Aug 2026 - unknown
10 Aug 2026 - unknown · https://www.isosklo.cz/uploads/3472943564.pdf

Questions about www.isosklo.cz

Is www.isosklo.cz safe?: The scan of www.isosklo.cz on 13 Aug 2026 reached no verdict either way (score -12). Too little was captured to judge it, which is an unknown rather than a pass.
How was www.isosklo.cz checked?: A static pass resolved DNS, captured TLS and headers and followed the redirect chain, and where the standard tier allows, a headless browser rendered the page and recorded every request. Egress is SSRF-locked. Signatures that matched only page text are weighted far below one that matched a served file, because a page documenting malware matches the same rules.

Scanned at the standard tier - see how URL scanning works.

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