Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdbd86a7db2a755…

MALICIOUS

PDF

76.0 KB Created: 2021-04-07 21:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 39170587e7ff115ac636e9b698c72cc6 SHA-1: 218c36ef80ee7701fff9932418cee7c1ae345765 SHA-256: fcdbd86a7db2a7559f83885a8d7f849b9aec77c3ad1b8d505c36a3c63bafe74c
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 external links, with a high heuristic indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via the embedded URLs. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

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://ponafet.ru/strik?utm_term=how+to+use+a+sears+torque+wrench PDF link annotation
    • http://shoop-fl.ru/xoruxajanamidomotazafvtiv.pdfIn PDF document text
    • http://lotsmen.com/gubulajiwixifdi77.pdfIn PDF document text
    • http://naturalik.fun/how_to_replace_drum_cartridge_xerox_3215zf110.pdfIn PDF document text
    • http://ontrade.top/boss_and_me_theme_song7mmcz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471252/normal_5ffdd8bf6da1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_601170fc387f2.pdfIn PDF document text
    • http://kukushpa.fun/diggy_2_unblocked_games_at_schoolw590z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368225/normal_5ff2565e27f2b.pdfIn PDF document text
    • http://fonareru.22web.org/ugly_sweater_party_invite_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wosamufudov.epizy.com/20945355982.pdfIn PDF document text
    • http://begosene.epizy.com/notice_agenda_and_minutes_of_meeting.pdfIn PDF document text
    • http://jakukimokop.rf.gd/clasificacion_de_las_energias_renovables.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/sopifededeziw.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/mitsubishi_mr_slim_error_codes.pdfIn PDF document text
    • http://xovebezot.rf.gd/meaning_of_bible_names.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/kado_the_right_answer_episode_12_summary.pdfIn PDF document text
    • http://fijazijan.rf.gd/kennedy_why_england_slept.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_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 5032 bytes
SHA-256: 6c10c364ce2449553b3776abe0c9fea78226182020160bdfbf8e864304aa1ad3
font_01_sfnt_off0000fed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 10612 bytes
SHA-256: f5654a76e159b7cea84a0eb89de7e8e2cace74021cb4eeee07c576cf238a2142

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