Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93a3b6edb14bd57…

MALICIOUS

PDF

70.6 KB Created: 2021-01-15 16:06:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 313844bc6aac70aeab9923bdd97d18dc SHA-1: 98443c78a638f1b64b115824efb21998e528e8d3 SHA-256: c93a3b6edb14bd5751ca5519483bc2aed1cf22660ec6164684c3fa38db083817
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary external URIs points to 'trafffi.ru', which is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and link farm heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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
  • 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=jim+butcher+peace+talks+chapter+3 PDF link annotation
    • https://site-1235153.mozfiles.com/files/1235153/california_registration_renewal_fee_report_attorney_general.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/9e6hfBa/princess_and_daddy_hair_salon_hatfield.pdfIn PDF document text
    • https://site-1174052.mozfiles.com/files/1174052/dried_blood_stains_on_sheets.pdfIn PDF document text
    • https://gosopitodemeku.weebly.com/uploads/1/3/4/8/134874694/6590500.pdfIn PDF document text
    • https://cdn.sqhk.co/piwixesiwufo/8hchdQk/cash_app_money_transfer_pending.pdfIn PDF document text
    • https://site-1203862.mozfiles.com/files/1203862/satekarizo.pdfIn PDF document text
    • https://site-1177444.mozfiles.com/files/1177444/skin_for_roblox_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/bZyUejb/sawitiriredufavoreb.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/bgchfjc/racing_fever_moto_apk_download_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/b8hj5Em/10263294374.pdfIn PDF document text
    • https://site-1168079.mozfiles.com/files/1168079/survival_island_game_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/pases_de_frica_e_suas_capitais.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 5528 bytes
SHA-256: 5a52f2c048c867b06d1a4463e6969e1046b9fa2aeddfaa76a074c6b802e0c5f2
font_01_sfnt_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 9884 bytes
SHA-256: 50e86a5c98d890d5f6b36ce9c712cb4af50a1ca7769e34a3ca4ae079e36cf00f

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