Malicious PDF — malware analysis report

Static analysis result for SHA-256 a950dabf40f3c083…

MALICIOUS

PDF

70.2 KB Created: 2020-11-17 17:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75aca1a7f402bea2af54e3538f9ce456 SHA-1: d40f222318756468a8d08a7c90fc1e2370af1353 SHA-256: a950dabf40f3c083b68afb8348c120c24ad666a9ef792be648a14cb1ec502321
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of phishing and fake CAPTCHA lures. The embedded URL, https://trafffi.ru/123?utm_term=gears+tv+apk, is likely used to deliver a secondary payload or redirect the user to a malicious site. The presence of PDF-specific heuristics and the fake CAPTCHA detection strongly suggest an attempt to exploit user interaction for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://trafffi.ru/123?utm_term=gears+tv+apk
    • https://cdn-cms.f-static.net/uploads/4386607/normal_5f97525a7b03d.pdf
    • https://cdn-cms.f-static.net/uploads/4389585/normal_5f91aac4bbb20.pdf
    • https://cdn-cms.f-static.net/uploads/4457005/normal_5fa1dda82cb00.pdf
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f89ea27d9410.pdf
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5f91e16cc1a9a.pdf
    • https://cdn-cms.f-static.net/uploads/4426415/normal_5f9b5a63386ca.pdf
    • https://cdn-cms.f-static.net/uploads/4375075/normal_5f938b373f573.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b03c8c6c-cdb6-4c7f-b42e-08d1dc891b5e/muvaxufafagumegafizev.pdf
    • https://s3.amazonaws.com/simujix/integra_ls_turbo_build.pdf
    • https://uploads.strikinglycdn.com/files/c74e595f-e15a-4c7d-b676-d1cce3cde6f1/bonolenidawovegemusiza.pdf
    • https://s3.amazonaws.com/jojitagifuva/15804023241.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d500.bin
ef752814c5daeab7afb18a4b4e104e3eb64aa16b33bb0ca155b577e39626e5bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 4936 bytes
font_01_sfnt_off0000e5e6.bin
699e5432e3ce9e9f649b7c9ca4b709caf73f3b46e855b698938e73a7873faa3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E6 11612 bytes

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