Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2f0129f0a2260a…

MALICIOUS

PDF

52.6 KB Created: 2021-01-08 16:09:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1cbbaff91f0e783ace8cd516511c691 SHA-1: c2d67e1225ac52dc62f038f2ee80130f1a2c0069 SHA-256: 4b2f0129f0a2260aac3ac2d0ab41d8d2ea3c89dd7720a628fab9477f1eb9e982
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7692

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
  • 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://traffset.ru/aws?utm_term=so+sad+status+whatsapp+video
    • https://govodiroruje.weebly.com/uploads/1/3/0/7/130775462/6101429.pdf
    • https://cdn.sqhk.co/xufatirumina/i3if8NW/warhammer_quest_2_the_end_times_gameplay.pdf
    • https://xosofanukofupa.weebly.com/uploads/1/3/4/8/134879033/7957020.pdf
    • https://guboriratuji.weebly.com/uploads/1/3/4/2/134235556/24552adb3.pdf
    • https://cdn.sqhk.co/disumuneriva/6igmMgg/87102881741.pdf
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5fa049ba2a4a4.pdf
    • https://voxomusixexuso.weebly.com/uploads/1/3/4/8/134851372/nokitadenikej.pdf
    • https://jowufawogutezob.weebly.com/uploads/1/3/0/9/130969037/dipubo.pdf
    • https://somubafe.weebly.com/uploads/1/3/4/4/134444697/kijor.pdf
    • https://cdn.sqhk.co/vilomikov/ijE6VM3/27578443385.pdf
    • https://xuvaguwofivopi.weebly.com/uploads/1/3/4/4/134463587/464d0e.pdf
    • https://uploads.strikinglycdn.com/files/b02702b8-6b09-41fa-81fd-e02c4fa45a0f/nonijenixelofax.pdf

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