Malicious PDF — malware analysis report

Static analysis result for SHA-256 914d75b92f458115…

MALICIOUS

PDF

52.6 KB Created: 2021-03-27 22:30:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 70eb8bbecfe5093a861a33ed08cabfeb SHA-1: 6b974643ed10883dab744a3c6749c268dbe5a367 SHA-256: 914d75b92f45811572b809615e724a432086bcb83aec1a9f01a59b44d966e599
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7645

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://xajibur.ru/aws?utm_term=what%2527s+the+hardest+song+on+beat+saber PDF link annotation
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    • http://bavomobes.22web.org/what_are_the_complex_solutions_for_x2-2x50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_60555e8c89fb9.pdfIn PDF document text
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    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_b0e62dddaa624b85ae67297f7666c83b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/titugome/cellular_organelles_worksheet_answers.pdfIn PDF document text
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