Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce25b87497ca8d2…

MALICIOUS

PDF

62.3 KB Created: 2021-03-07 09:02:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 316aaa32a9c8a212f9fe234fb3be3dd1 SHA-1: 45a6e6bd4dd3cc67ff3a3f8494051bf3e958b9e7 SHA-256: 7ce25b87497ca8d2fbfb8ad73e2e8e9179850617622d4e13dab6e23a5a26edc8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that lead to suspicious domains, masquerading as search results. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's prediction strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5432

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://soxebez.ru/award?keyword=is+nitro+cold+brew+coffee+bad+for+you PDF link annotation
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    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_e9a99223f9064941b0bbb148ce64fbef.pdf?index=trueIn PDF document text
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    • http://zubiluwetij.myartsonline.com/41073267926.pdfIn PDF document text
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