Malicious PDF — malware analysis report

Static analysis result for SHA-256 0791cf1c0bdb4236…

MALICIOUS

PDF

72.4 KB Created: 2020-12-15 19:09:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12d0692e5a9cefe31c2db567b8b139a2 SHA-1: 74e0fa5af3044d58e8f2e23cfd787d522048c18a SHA-256: 0791cf1c0bdb4236b04c4969df0b243036eee3425db451661ed8c8c05688da5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One prominent URL, https://trafffi.ru/strik?utm_term=motorcraft+mercon+v+advance+auto+parts, is flagged as unknown reputation and likely serves as a redirector or landing page for malicious activity. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=motorcraft+mercon+v+advance+auto+parts
    • https://cdn-cms.f-static.net/uploads/4504788/normal_5fb5b7a85b592.pdf
    • https://kesolijizik.weebly.com/uploads/1/3/4/2/134265964/netomizabezelopo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gonafoziguwewe/beautiful_wallpaper_2019.pdf
    • https://s3.amazonaws.com/naxizugenabi/54336750687.pdf
    • https://uploads.strikinglycdn.com/files/44db3ed4-6faa-4ddc-98eb-e5ec1630ba1d/d3dx9_26.dll_que_falta_need_for_spee.pdf
    • https://s3.amazonaws.com/sivanira/serie_a_table_18_19_wiki_template.pdf
    • https://static1.squarespace.com/static/5fc6ebfc418d7934ac73dcfc/t/5fce42c0662d5e24e0cfa9c4/1607353028206/napuvojo.pdf
    • https://s3.amazonaws.com/zerejibixupav/jepolevepidagusegupalozi.pdf
    • https://uploads.strikinglycdn.com/files/8f2ddd0e-9251-44a8-b88f-f51bc61e2ecd/30474854600.pdf
    • https://s3.amazonaws.com/zonebon/ielts_speaking_band_9_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d17a.bin
3e873c91cc21c60556b022a191138354b2c53238a124214fa73eaa17c076ec40
pdf-font-stream PDF embedded font (sfnt) at offset 0xD17A 5168 bytes
font_01_sfnt_off0000e2f1.bin
14005f323932e60c6c39deaa92002c1f7038cd01ccaf0454d768513fe053a468
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 10480 bytes
font_02_sfnt_off000106ce.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 4324 bytes