Malicious PDF — malware analysis report

Static analysis result for SHA-256 4abcd116904a7322…

MALICIOUS

PDF

76.0 KB Created: 2021-06-07 23:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 335203048f0d419746b7f3a139aa1f9d SHA-1: 3d5164dc324531a21dc643bc21faa0f326d49e86 SHA-256: 4abcd116904a7322d8728ed90b24f557749b00e8565afc914606ae22653ec29f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to redirect users. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt.

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://gimoguvi.ru/123?utm_term=star+answering+interview+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378843/normal_6033ee8d495fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393026/normal_60585e8727be7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449630/normal_5feb2b3dd798e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff356a2-fd6a-45e6-881f-e65db888682d/69963668570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42abada8-a052-4623-80fe-10c48eff49cd/missing_angles_in_quadrilaterals_worksheet.pdfIn PDF document text
    • http://refarumiba.pbworks.com/w/file/fetch/144753654/ielts_general_writing_important_tips__high_scoring_sample_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fe99ff2-3ffe-4f7f-83fc-101d2e501466/what_are_the_factors_affecting_bearing_capacity_of_soil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37d5069-7c33-4a01-8537-e6f42dd60964/kentucky_exit_polls_2019.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/11527744021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa3258a-73c3-4ea8-a2d2-b5ef4bde1843/which_is_stronger_acid_hcl_or_ch3cooh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e55667f0-6b8d-41ba-8c23-0c78ef5b5bd3/nugowubuzadipiwukawumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be4cdf2f-6682-44a1-9ea7-76c8a47a8365/unidad_3_leccion_1_practice_games_answer_key.pdfIn PDF document text
    • http://xuladejuzor.pbworks.com/f/free_fire_aimbot_hack_script_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/617ec102-1741-44fa-9986-3398c57c2aec/dabewuzovalor.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144479940/xexokikanukowiwedumuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68755dbd-6bb3-4bbc-9f3f-5fbab0f63597/acer_aspire_e15_user_manual.pdfIn PDF document text
    • http://gonumutat.pbworks.com/w/file/fetch/144516768/kemosojazirubajemakivosup.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/w/file/fetch/144511344/how_do_i_write_a_simple_application_letter_for_a_teaching_job.pdfIn PDF document text
    • http://pudomasepok.pbworks.com/f/vuzijunawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9202c488-07e3-4b42-b190-ebd91122deb8/39099839777.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_off0000ed16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED16 5200 bytes
SHA-256: d47e4ce9d6aecc5c75b5389b913a8128f733da295e4306c6fd345494b2ace0bf
font_01_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 10596 bytes
SHA-256: 769b433b3c9d4dd42bc2889a58f7a026e30c6e16e430e6bff12c55869a84f795