Malicious PDF — malware analysis report

Static analysis result for SHA-256 7306c8dc1ef2d29f…

MALICIOUS

PDF

72.4 KB Created: 2021-03-01 09:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ac1b6383b554efbc16d88a6a913a32e SHA-1: da62e4bbae7636bbbeb53c64e69867bae2e74a2a SHA-256: 7306c8dc1ef2d29fcc27c82aaf2723a8228521433f6fb2397e84cc9f5ba503b6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=how+to+pause+render+in+cinema+4d PDF link annotation
    • https://midejewafefo.weebly.com/uploads/1/3/4/0/134000268/sugojatafer.pdfIn PDF document text
    • https://kopiwuzurori.weebly.com/uploads/1/3/1/3/131398237/891c8efabb3a.pdfIn PDF document text
    • https://lobepujijas.weebly.com/uploads/1/3/5/9/135966441/496a1.pdfIn PDF document text
    • http://zowiramizowomo.iblogger.org/danby_portable_air_conditioner_manual_dpac8kdb.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/5ab764961e1.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/GiBihhf/wufuv.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/hhpijji/nostalgia_electrics_snow_cone_maker_instructions.pdfIn PDF document text
    • https://veraroligesabo.weebly.com/uploads/1/3/4/3/134377370/gobazonidogafum-baxujekego-movojezumukozud.pdfIn PDF document text
    • https://towelekuw.weebly.com/uploads/1/3/1/4/131406253/47515efa0.pdfIn PDF document text
    • https://fiwigerisen.weebly.com/uploads/1/3/1/4/131408459/kotowuvokon.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/36a3c0e56004.pdfIn PDF document text
    • http://toselarasomax.iblogger.org/national_criminal_record_check_form_nsw_health.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/vavale/boxing_star_equipment_guide.pdfIn PDF document text
    • http://timodetunidup.epizy.com/37720748193.pdfIn PDF document text
    • http://seluzapiz.rf.gd/microsoft_word_2010_exercises_for_beginners.pdfIn PDF document text
    • http://davagutuvis.rf.gd/54390273466.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_off0000deee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEE 5328 bytes
SHA-256: cd5c04830129103d7a0bc8d2a662f1e7fc3e11b8d738a2320974db16df594ace
font_01_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 10300 bytes
SHA-256: 1d9b632ffded2a348e29c6b61369559b5bd774f3349f4914a47de7b5536c3b62

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