Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e2999367d598b1…

MALICIOUS

PDF

131.2 KB Created: 2021-03-14 11:44:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 952df04c1d45a11d7fb9ddf440ac83ed SHA-1: b523951f521d7ea0775133f7d7cb4a1e844448c0 SHA-256: e9e2999367d598b13c46dc80a556c81a658ac054d9052c92e6e653ff2fd0d60f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with a high-confidence heuristic flagging it as a link farm on disposable hosting. The ML classifier and ClamAV also identified this PDF as malicious. The document body, though heavily obfuscated, contains text related to dealing with disruptive students, suggesting a social engineering lure to direct the user to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9396

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://ponafet.ru/strik?utm_term=how+would+you+deal+with+an+extremely+disruptive+student+in+one+of+your+lessons PDF link annotation
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