Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca633f4c9c5eb9d…

MALICIOUS

PDF

50.6 KB Created: 2021-03-06 04:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad541a0d19878c5d53e3cd54317aab9d SHA-1: ed79eae49d92664ae9eb19027c114f2b21dae9b7 SHA-256: 6ca633f4c9c5eb9d128e6fad423dfb2f1d8f32cee515a33af737908941a66aa9
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The PDF_IMAGE_LURE heuristic indicates it's an image-only document designed to trick users into clicking an embedded URI, which is a common phishing tactic. The document contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7456

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 50 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/aws?utm_term=80s+quiz+game+answers+level+13
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