Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edef1c993959abe…

MALICIOUS

PDF

78.3 KB Created: 2021-02-15 13:20:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e10295161982854a64457f23d006ce22 SHA-1: 481ee9dc7a5bcd6714f39d7343fc7e03be468da2 SHA-256: 8edef1c993959abee209b13db1d7e7998114b2c9e08d4ff9f3dfffb1c302cb5c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or scam campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to redirect users, likely for malicious purposes. The ML classifier and ClamAV detection further confirm its malicious nature, with the latter identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=beats+solo+2+wireless+reset+not+working PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492281/normal_5ff7ca436e4cc.pdfIn PDF document text
    • https://wotowabe.weebly.com/uploads/1/3/4/6/134688823/kifunuximifabif-pupanaj-wepafugepitogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_5fd39fa2794d0.pdfIn PDF document text
    • http://nicechange.space/vevetozokototexf1qly.pdfIn PDF document text
    • http://sodalabs.club/lagujimapozuvupisihsarl.pdfIn PDF document text
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/16269f3f697.pdfIn PDF document text
    • http://creditreportfast.info/flight_simulator_games_mod_apkqs9qf.pdfIn PDF document text
    • http://esportzmlevent.com/mezijijewite0kwq.pdfIn PDF document text
    • https://togodinaxudare.weebly.com/uploads/1/3/1/6/131637070/6386331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_6020cf4e8cdb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479938/normal_5ff65acfd435e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471723/normal_5fe9c9245d823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461481/normal_5fd1cb6f7fcdd.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/dudurat/18406287546.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/biology_notes_form_3_advance_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/email_party_invitation_templates_free.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_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 5192 bytes
SHA-256: 9fe94f30df0ffee8340e9eea5983526ab87e3ffe69380947681c46ca6f3c6eed
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 12336 bytes
SHA-256: 2c6e7feabcc64ab0a2f3a4c28521def50f62354b12d2880453c355fe4910bcf1

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