Malicious PDF — malware analysis report

Static analysis result for SHA-256 40156a5380eeca51…

MALICIOUS

PDF

59.7 KB Created: 2021-04-03 19:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f5894396b36043acbb60bf36516b0cb3 SHA-1: df489ce100e227b7fe25bdaa775419bcef2fbf11 SHA-256: 40156a5380eeca51d7b6d2cdce25b2525aee079fca6e23a27da06fd636308e4b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, with one specifically pointing to 'zajinet.ru/strik' and a heuristic identifying it as a link farm on disposable hosting. ClamAV detected it as 'Pdf.Phishing.Trojan', and an ML classifier also flagged it as malicious. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6841

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=computer+system+validation+as+per+who+guideline PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420939/normal_5ff247dc6c711.pdfIn PDF document text
    • http://puviwaxeraw.22web.org/minecraft_calm_1_piano_sheet_music.pdfIn PDF document text
    • http://pegixudovojap.iblogger.org/the_anarchist_cookbook_illegal_uk.pdfIn PDF document text
    • https://povilaromegew.weebly.com/uploads/1/3/4/4/134486615/mimabulo_pemotazifetuzad.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/c7a0fa41e1.pdfIn PDF document text
    • http://tryraisins.club/language_of_flowers9w693.pdfIn PDF document text
    • http://espacecmb.xyz/xavisorarifijip93.pdfIn PDF document text
    • https://ginataxidorivez.weebly.com/uploads/1/3/4/0/134041929/gejig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470020/normal_601b2f2d933c1.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/vWhdrT7/53168288674.pdfIn PDF document text
    • https://rinuvimasajef.weebly.com/uploads/1/3/2/6/132695862/7153393.pdfIn PDF document text
    • https://cdn.sqhk.co/gusorewiwal/pkhaiib/affiliate_platforms_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/teruzemoru/6gdnjic/73281439011.pdfIn PDF document text
    • http://sovetnik53.ru/how_to_make_chai_tea_like_dunkin_donutsravcx.pdfIn PDF document text
    • http://myfavoritesun.xyz/958703387751pyuq.pdfIn PDF document text
    • https://zujefimobob.weebly.com/uploads/1/3/1/4/131453463/posijives.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485161/normal_5fde3a352315a.pdfIn PDF document text
    • http://rebobimakefeli.epizy.com/hum_aapke_hain_kaun_songs_musicbadshah.pdfIn PDF document text
    • http://tovujopojat.epizy.com/bluetooth_headphone_for_android_phone.pdfIn PDF document text

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