Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b59640263c40a3…

MALICIOUS

PDF

79.5 KB Created: 2021-04-21 02:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: eef08b6f035abc02c567c87fb286bfbc SHA-1: 7b10439ac3d7d79bd56e2ffff575771fb69b6df5 SHA-256: 59b59640263c40a3cf4e6156be93917a8bfbf5cc48fa02feb70c9170dc3a54a8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by heuristics as a link farm and potential phishing/malware distribution point. The document body, though heavily obfuscated, suggests a lure related to COVID-19 travel rules, aiming to trick users into clicking the malicious links. The presence of external URIs and the ML classifier's output further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5052

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=what+are+the+covid+rules+for+flying+to+spain PDF link annotation
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