Malicious PDF — malware analysis report

Static analysis result for SHA-256 34bdaf5b4287fdab…

MALICIOUS

PDF

71.2 KB Created: 2021-04-02 05:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e5c5c8f55cb8bb01770842d61edcfd90 SHA-1: 3ed9c79a7045b1180473f008a8b1a8789be7458e SHA-256: 34bdaf5b4287fdab4d5c59900ba7a430cb0c6f5b2a686d3707c0629a5b984fd1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The presence of an external URI pointing to 'jumiwimov.ru' suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=monocular+visual+odometry+tutorial PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469101/normal_6012b12d322ac.pdfIn PDF document text
    • https://cdn.sqhk.co/xosaletozobi/bhcjgif/newijujenosivubat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_603cb59e31f14.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/gf6ggie/43729881321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_6052a68d25cf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422640/normal_5ffa7f8d231c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464523/normal_601b7057f0b49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_605d7996603bf.pdfIn PDF document text
    • http://complerbnp.com/how_to_change_height_on_rainforest_jumperood6f92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386834/normal_5fd61288b075e.pdfIn PDF document text
    • http://csxmoney.info/bricks_of_egypt_free_online_game180ed.pdfIn PDF document text
    • https://cdn.sqhk.co/ranotigu/1Mi2ihr/hide_online_unblocked_games_66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379380/normal_5ff04817a3134.pdfIn PDF document text
    • http://mushygushysayings.com/light_me_up_ingrid_meaning8ixmh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374207/normal_604c9f4f539f0.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/wJpC9ig/srs_distribution_assistant_branch_manager_salary.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/vitarakono.pdfIn PDF document text
    • http://fasad-dom.site/introduction_to_ionic_and_covalent_bonding_worksheet_answersp47ls.pdfIn PDF document text
    • http://rosativiwam.mypressonline.com/how_to_install_club_car_precedent_light_kit.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/826265742497ifdo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gefilodeza.myartsonline.com/niwejizitimuge.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_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 5252 bytes
SHA-256: dccabe9cdcc8d521a7c973f6c5f7607662810ac0c427c21ceb4d110e8a730179
font_01_sfnt_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 10996 bytes
SHA-256: a7503e1c1b19de98936892a756f4b01cb06bf0e77c4eb140ef8cf663f91e3549

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