Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a32185e9be62e8…

MALICIOUS

PDF

74.8 KB Created: 2020-11-21 03:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 205a930768564e277af328e8f351e358 SHA-1: d5f5ef0c8d8da977dc31fa8846bccdaf83bf349d SHA-256: 91a32185e9be62e87f0fecb3af39d12d6c5c982be3911e49bd302431ebf31774
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a tactic to manipulate search engine results or distribute content. The presence of a malicious ML classification and ClamAV detection indicates a high likelihood of malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content distribution scheme.

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://trafficel.ru/123?utm_term=mobile+home+purchase+agreement+download+free+template
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/bubutowunaj.pdf
    • https://cdn-cms.f-static.net/uploads/4452599/normal_5fa86bb3421bc.pdf
    • https://gavuzamamezi.weebly.com/uploads/1/3/4/5/134590232/5819275.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/dcf44c59-2995-4288-976f-27ed62e85a8d/15017617288.pdf
    • https://uploads.strikinglycdn.com/files/9678472c-b41b-443a-a356-5f823c74a14a/durga_mata_ki_aarti_hindi.pdf
    • https://s3.amazonaws.com/mozirolinitaje/capital_markets_interview_questions_and_answers.pdf
    • https://s3.amazonaws.com/voropa/chemistry_and_physics_of_modern_materials.pdf
    • https://s3.amazonaws.com/sulasatevirexo/21151624227.pdf
    • https://s3.amazonaws.com/rudelazifizuvo/33362055985.pdf
    • https://uploads.strikinglycdn.com/files/a7cc6da6-df20-43e0-a1b3-3ffcd58f9add/nukiwudoxezem.pdf
    • https://uploads.strikinglycdn.com/files/d575b754-74ba-4a77-81b1-3b4138c94b04/19940254408.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_off0000d900.bin
6700e077c37004426144ecb5deb6d5ce97c5c7899e29b7b2209b7563a7513f84
pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 5688 bytes
font_01_sfnt_off0000ec38.bin
d9566db7e2fa93507b2d4ee65f70b528b6a2c7662a47625474ee3c7e3151e582
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 10540 bytes
font_02_sfnt_off00011057.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 4324 bytes