Malicious PDF — malware analysis report

Static analysis result for SHA-256 24a9b3694a83eaa5…

MALICIOUS

PDF

71.1 KB Created: 2021-04-15 07:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0981b11a6c11f97346cb5539a32d21b0 SHA-1: 9173b859b83e6f74ea187c99630b6d9d8ef5afd0 SHA-256: 24a9b3694a83eaa59bde7c5f0e7b83224133d4fdbfd833f30199676ed9690f21
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 multiple embedded URLs, with one prominent URL suggesting a lure related to 'Thermador stove cleaning instructions'. The presence of numerous links on disposable hosting indicates a link farm designed to redirect users to potentially malicious content, likely for downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=thermador+stove+cleaning+instructions PDF link annotation
    • http://dedefazofe.iblogger.org/mac_os_terminal_commands_cheat_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_603ad5a80cd95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470540/normal_604a4963f2d00.pdfIn PDF document text
    • http://puwufonizezez.22web.org/joriv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_5fdc6a9b17aa9.pdfIn PDF document text
    • http://urro-hu.com/how_do_i_reset_my_lorex_dvr_to_defaultzedf5.pdfIn PDF document text
    • http://trysoda.club/kenmore_elite_he4_gas_dryer_not_heatinguwasb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369653/normal_5ff96e7d2b791.pdfIn PDF document text
    • http://cocobeautybar.ca/76201979589h9d8n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saxopurokike.rf.gd/whatsapp_app_for_windows_7_ultimate.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/542264332.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/64123041917.pdfIn PDF document text
    • https://s3.amazonaws.com/paxunu/40292749427.pdfIn PDF document text
    • http://moxawaten.epizy.com/gisoposojunokitosavitume.pdfIn PDF document text
    • http://jerokiguwipifo.rf.gd/whats_inside_the_harry_potter_advent_calendar.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_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 5364 bytes
SHA-256: 893fe2d953b86ee97de346521b1cf5d4481ea06c77e1b115c0326e6d0559ce13
font_01_sfnt_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 10536 bytes
SHA-256: 69617eae7f7a6927aa14472d7c2fe6ae9d70bac876dfd645b80272960489a90a

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