Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c74163a54960d72…

MALICIOUS

PDF

67.6 KB Created: 2020-11-21 22:36:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e295f5df3b586fb246d73c3469de4ada SHA-1: 9c6419c0977bb549206a949f58b57585ae972d60 SHA-256: 5c74163a54960d725fea036fca4226b2adb05d067ac456d64169eca02ac18d92
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple external links, many pointing to disposable hosting, and one directly to 'traffnew.ru'. This heuristic, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a malicious intent to redirect users to a potentially harmful site. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents for SEO link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9035

Heuristics 5

  • 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 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.
  • 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://traffnew.ru/aws?utm_term=free+homework+planner+template+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5f875f9a4d1e2.pdfIn PDF document text
    • https://zoxamadafipezo.weebly.com/uploads/1/3/1/1/131164297/vixebo-garofe-vemolexozisuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423155/normal_5fa1b2cde0538.pdfIn PDF document text
    • https://dojumavuj.weebly.com/uploads/1/3/3/9/133997280/8753964.pdfIn PDF document text
    • https://tebebutak.weebly.com/uploads/1/3/4/7/134744698/jamaxujidewakoj_radogojuxetudaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379473/normal_5fa9de7f3d4d1.pdfIn PDF document text
    • https://konozobit.weebly.com/uploads/1/3/4/4/134456152/sominux.pdfIn PDF document text
    • https://wonenizawelob.weebly.com/uploads/1/3/4/3/134315845/novepojuwubafir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd3be53-14ef-4112-a0ac-5268b75568a2/livafedad.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/best_search_engine_for_books.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/leaf_garland_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c84092-0469-4b35-9e85-3fe595b82de8/20393157345.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/game_brother_in_arms_2_apk_data.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c575023-9ca7-4d96-9db6-147795005bb5/92875183537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a94947c-fbbc-4387-944e-97908969c75d/fire_red_battle_tower.pdfIn PDF document text