Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2db865b96db751d…

MALICIOUS

PDF

88.1 KB Created: 2021-02-28 08:45:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27bcc324a0ac1d61640bb9a16d7133f1 SHA-1: 2a316c5bbaf020a00912508d22e75be368a22add SHA-256: f2db865b96db751d61ed6acec2a70a7a21753edad6ede23fe8e91c7f6c5a782a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large farm of external links, with the primary URL being https://dafemum.ru/aws?utm_term=medieval+german+clothing. The PDF_SEO_LINK_FARM heuristic indicates a mass of 30 external links, suggesting a link farm or phishing attempt. No scripts were extracted, but the presence of numerous external links points towards a malicious intent to redirect users to potentially harmful sites.

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-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://dafemum.ru/aws?utm_term=medieval+german+clothing
    • http://vadosaj.getenjoyment.net/pebupagesorenu.pdf
    • https://cdn.sqhk.co/tamurikubol/gjgabgf/colony_wars_ps1_gameplay.pdf
    • https://cdn.sqhk.co/pazaxefuma/fs91Rih/hero_xpulse_200_review_malayalam.pdf
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/9640992.pdf
    • https://cdn.sqhk.co/bumogebiz/tmYihjc/mortal_kombat_9_klassic_skins.pdf
    • https://cdn.sqhk.co/seponidozit/Ngchdhh/72877405827.pdf
    • https://cdn.sqhk.co/xewazezikufi/ejjzMjK/gavekobozokebunodamapen.pdf
    • http://fesabip.iblogger.org/can_you_get_adobe_illustrator_for_free.pdf
    • https://cdn.sqhk.co/novitovikor/iajjjct/35466154906.pdf
    • http://dobewobezusisof.iblogger.org/candy_crush_soda_for_windows_7.pdf
    • http://tukudetu.iblogger.org/samsung_wf350anw_xaa_capacity.pdf
    • https://vurejubi.weebly.com/uploads/1/3/1/4/131454114/texarufavileziwa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://medexode.atwebpages.com/59426508026.pdf
    • http://fepenupusabumo.rf.gd/apple_router.pdf
    • http://varupasasadutab.rf.gd/36310428955.pdf
    • http://futakanawus.onlinewebshop.net/wizards_and_warriors_nes_game_genie_codes.pdf
    • http://pexaniruvuwuwe.rf.gd/chimney_inspection_report_template.pdf
    • http://zoduxipuvivedab.rf.gd/slate_roof_maintenance_guide.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_off00011b39.bin
deb3e8aa4c656fa0bc75c4abce0eafc72f449052ddd526f43be3cc0c98f6979a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 5240 bytes
font_01_sfnt_off00012cf4.bin
d83c6470f503daa1700510858ed1c621a1ea05bd896d17ffeb41e92f4052b064
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF4 11756 bytes