Malicious PDF — malware analysis report

Static analysis result for SHA-256 43dafd3fcf0dcf3b…

MALICIOUS

PDF

46.4 KB Created: 2021-03-07 23:08:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7a547535ef7152979450b3d8138fb75 SHA-1: 9bfc589d5a3f8ec01c1c426ebeb753c179b9a9be SHA-256: 43dafd3fcf0dcf3b9c1c8fa50f56704bc0c26e1235267365992d16f45ef8109f
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, suggesting a visual deception tactic. Multiple external links are present, including one pointing to 'https://crophysi.ru/strik?utm_term=nuvi+2555+specs', which likely serves as the primary redirection for malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7134

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 46 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://crophysi.ru/strik?utm_term=nuvi+2555+specs
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