Malicious PDF — malware analysis report

Static analysis result for SHA-256 d891440138a38345…

MALICIOUS

PDF

66.6 KB Created: 2021-03-04 02:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa12efb431ad9d12a8f12827449fd4c2 SHA-1: a4437da076ec77be320fd12c936a797d8956342c SHA-256: d891440138a3834542906c66a252018517a881849e2e8a5c44e43d7eea6b9e83
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9545

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://nipisod.ru/strik?utm_term=normal+distribution+table+negative+pdf
    • https://static.s123-cdn-static.com/uploads/4413000/normal_5fc7cce2cad88.pdf
    • http://xuwuvewisin.mypressonline.com/pivezema.pdf
    • http://tijudiwulewanuw.getenjoyment.net/gutufujaburiledax.pdf
    • http://waferaboteb.mypressonline.com/guerra_de_guerrillas_mao_tse_tung.pdf
    • https://cdn.sqhk.co/giripiponi/FDjNgfr/ps_vita_remote_play_keeps_disconnecting.pdf
    • http://nadipewin.mywebcommunity.org/princess_diaries_2_full_movie_english.pdf
    • https://cdn.sqhk.co/tinipuded/aggCKhh/auto_clicker_download_for_ipad.pdf
    • https://giruwaferelesed.weebly.com/uploads/1/3/4/8/134850821/ca34e.pdf
    • https://cdn.sqhk.co/vibisidumes/iMyharE/mukakos.pdf
    • http://9gusevshop.website/photo_collage_editor_online_free_downloadx3vub.pdf
    • https://cdn.sqhk.co/vobevufubito/gecgfb0/88088363690.pdf
    • https://cdn.sqhk.co/xewafazuk/gAogiie/28359137595.pdf
    • http://tediguku.atwebpages.com/manokaxibaba.pdf

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