Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc53fce577e35e7…

MALICIOUS

PDF

77.0 KB Created: 2021-03-22 10:03:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a522355d06d8d3036814f4b33cb31e8a SHA-1: 559fe79fabf8cee077350fee64e9d7d9e936270d SHA-256: 4dc53fce577e35e72e1a61667395148719b72a7b0468d4a56ad8ceee4057e561
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains multiple embedded URLs, one of which, 'https://vilenefex.ru/123?utm_term=anatomy+of+human+body+drawing+pdf', is directly associated with a heuristic firing for an external URI. The document body, though heavily obfuscated, suggests a lure related to 'Anatomy of human body drawing pdf', indicating a phishing or malware distribution attempt. No scripts were extracted, but the presence of external URLs points to a likely download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=anatomy+of+human+body+drawing+pdf PDF link annotation
    • http://naturfresh.fun/how_much_does_it_cost_to_replace_a_computer_fanhr10w.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/gcTiimd/edmund_campion_school_uniform.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/gcTeHhQ/43209591189.pdfIn PDF document text
    • http://1ux.site/54122086670vp4ur.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/ahGYLia/pressure_gauge_checker.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/qKiikC5/winking_lizard_tavern_lakewood_oh.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/9m0sicN/9040478454.pdfIn PDF document text
    • https://cdn.sqhk.co/gedofovel/hhbjje2/22432312233.pdfIn PDF document text
    • https://cdn.sqhk.co/saxezekobida/wnMicib/71859984107.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/dijhgQU/sabelirepo.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/bO8nfZz/2166231640.pdfIn PDF document text
    • https://cdn.sqhk.co/sifajoxojif/ghdtFss/78558504006.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/hviijjJ/jump_rope_workout_routine_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/heiaS7W/serigojanamamovanemoloke.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/sjgS0Va/7830668557.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/2edc514d-80e0-4421-ae2d-365ed5aa3e7e/pentair_intellichlor_salt_chlorine_generator_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5073f35-4b35-43ab-bb6a-acb48072866b/what_legendary_pokemon_does_red_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9075aadf-4f20-45fe-a2c5-26139ad0eed3/starting_pay_for_starbucks_barista_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/571592f0-ea7b-4197-8570-f7c1b7cc947b/28967541099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c59ff42-8f99-4f7f-ac0b-7e5b872e114d/craigslist.org_dayton_ohio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5c90da-e8d7-452a-86f3-ca03a834b979/37317459692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77731ec5-90e2-4939-907b-8decdeb5c2db/john_dewey_democracy_and_education_publisher.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_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 5568 bytes
SHA-256: dc7ffc1e2edac8ac35b91e4b3618f2dd597fc8dd5cfe826c352ac86b3521a48c
font_01_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 11152 bytes
SHA-256: 297b4bdef785342b34ddd1c111d0bcc9189755172ac050b34e31548e7ee206bb

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