Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2b62e25e358ab3…

MALICIOUS

PDF

80.8 KB Created: 2021-03-22 05:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 394cc62cde77edff9676ae7ae41948c6 SHA-1: 9467e60febc574357966dc3b029b5a4891092c99 SHA-256: 8f2b62e25e358ab33e2e5be32ede2bd26179f6da112dac1d7b803cf53f0d7fba
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, suggesting the document is part of a larger scheme to distribute malware.

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://bologen.ru/award?keyword=examen+de+ingles+toefl+pdf PDF link annotation
    • https://nodarato.weebly.com/uploads/1/3/4/4/134487471/nomufes_manituta.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/iQSZ6XG/zikizedevalamexeluwipazo.pdfIn PDF document text
    • http://mmmmmme.space/carrom_pool_hack_filen08xd.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/6861017.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/703847698350ik25.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/wunozetujavukufawuwenepoz.pdfIn PDF document text
    • http://netewe8.xyz/18811158849kvmll.pdfIn PDF document text
    • http://puduvab.sportsontheweb.net/academic_performance_of_university_students.pdfIn PDF document text
    • http://pukujadud.getenjoyment.net/why_did_montresor_decide_to_kill_fortunato.pdfIn PDF document text
    • https://cdn.sqhk.co/bevurokakug/xihgfV8/baked_margherita_chicken_wings.pdfIn PDF document text
    • http://businesshelpservice.com/nufoze1geko.pdfIn PDF document text
    • http://servicesforsupport.com/gipuvefasafaza2lxoc.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/my_revision_notes_aqa_a_level_economics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feferabi.atwebpages.com/2778104736.pdfIn PDF document text
    • http://xogijowag.onlinewebshop.net/biology_101_lecture_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31732d6-2002-490b-aec1-dea6c9dae892/totakadulegorejenafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3714148-5738-43f9-a1ae-a8b3c5bfbd13/how_to_connect_pc_to_onkyo_tx-nr626.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_off0000fc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2A 5288 bytes
SHA-256: 33599e6dd66825b33fd473f522765d7dc61c7e4738a78e4f9ee5496969659c58
font_01_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 11844 bytes
SHA-256: b666170480faa55f1797f7869fac129c3eb062e7ef9645eb0155b75223e3e15d

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