Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa546ebe6029aad4…

MALICIOUS

PDF

73.0 KB Created: 2021-02-18 04:30:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7379a28c714b22928276ea0f72e85b38 SHA-1: ceae2e3aad5cf43392e375376054668b4d4ea5bd SHA-256: aa546ebe6029aad430973604b4cd68450854ca024f4c9a268e2a63768cd53f51
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a 'warhammer 40k' review, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=warhammer+40k+first+strike+starter+set+review
    • http://resimpub.com/dragon_age_awakening_oghren_conversation_guide9s815.pdf
    • http://badodamibevije.iblogger.org/tumapafalidolofezojo.pdf
    • https://cdn.sqhk.co/kafevinuva/bheNuId/867383562.pdf
    • https://cdn.sqhk.co/mabisurud/aifKPjb/taxi_sim_2020_apk.pdf
    • http://tacfitproducts.com/personal_report_of_public_speaking_anxiety_surveym7s76.pdf
    • http://homebig.space/somamady3u7m.pdf
    • https://cdn.sqhk.co/zowonefaso/hhL9hiG/mivivufurosizabizone.pdf
    • https://cdn.sqhk.co/zikegasenar/ijgfbNo/shelter_island_restaurants_open_for_lunch.pdf
    • http://centerverifybadge.com/download_drake_pop_style_mp3ehhaj.pdf
    • http://auto-fishing-rods1.club/89536160202loni7.pdf
    • http://flowerport.store/farm_financial_analysis_excel_templateqv1j0.pdf
    • http://fastgetme.online/94656992010fsyy6.pdf
    • http://naturebiolog.space/vitosunapnha4.pdf
    • https://cdn.sqhk.co/tekuligote/dejczhb/8357979053.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jajoxutevo.epizy.com/17257633485.pdf
    • http://zelalosiker.rf.gd/anjana_bihu_songs_2002.pdf
    • http://fibubaxuvuvixik.epizy.com/57061805205.pdf
    • http://jasosuwer.epizy.com/tikofexem.pdf
    • http://titegerekarirov.rf.gd/gubiwapupi.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_off0000dd69.bin
65e5e77ec0d641db59ae526b2c262e06cef38aabb2f32275a2d90a19dda0f656		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 5432 bytes
font_01_sfnt_off0000efdb.bin
ff53ddd4c0fe99a33029c57ec10f8e593426c564100b3e5b6f4453965c35a9a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 10840 bytes

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