Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1239700b2bdc69b…

MALICIOUS

PDF

69.2 KB Created: 2020-12-28 09:11:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 88398bfcec4ad12560898f980f5e38aa SHA-1: 1599abcec6b285d067126b6cf6a7b3426b62198a SHA-256: c1239700b2bdc69be309af156bb8c05d81aedbe5689aebb6ec6a850c91ffa749
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, indicating a link farm or distribution mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to redirect users to potentially malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffnew.ru/123?utm_term=wild+eyes+contacts+discontinued
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f96a62c2b9af.pdf
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f8aaaf0efea1.pdf
    • https://cdn.sqhk.co/samivegin/ghkhivq/47918376039.pdf
    • https://static.s123-cdn-static.com/uploads/4453333/normal_5fde6742d9c21.pdf
    • https://cdn-cms.f-static.net/uploads/4413109/normal_5fc02f1b331ac.pdf
    • https://cdn.sqhk.co/wepuvumug/bgcjdha/29772164329.pdf
    • https://nonikezit.weebly.com/uploads/1/3/4/3/134335915/funepetumu.pdf
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/2003429.pdf
    • https://garepogive.weebly.com/uploads/1/3/4/8/134871831/xedofutoduladadat.pdf
    • https://cdn-cms.f-static.net/uploads/4380405/normal_5fd2adb7bd30e.pdf
    • https://cdn-cms.f-static.net/uploads/4376858/normal_5f9ebbcf1e01b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0212b121-bf0f-4620-9469-2ff830441c83/the_paper_bag_princess_activities.pdf
    • https://s3.amazonaws.com/wilugugo/pizutelot.pdf
    • https://uploads.strikinglycdn.com/files/a772478c-79d3-4379-9712-5efcdd0fd90f/59135617909.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_off0000d280.bin
51cf1bb8a7d538b41c4b40e3d957e0857633e6e28aa7df53b51aac22e6c2670b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD280 4952 bytes
font_01_sfnt_off0000e383.bin
87c3b4244774748267b2b89b69a6705076659fb50f8f5198600059a7bac058bc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 10868 bytes