Malicious PDF — malware analysis report

Static analysis result for SHA-256 298c6be9ffa5a0aa…

MALICIOUS

PDF

79.6 KB Created: 2021-03-23 04:17:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 626ddaa49fd628284972a89fac168995 SHA-1: 2477231e1987ae72e17f45823b560beadcb2906e SHA-256: 298c6be9ffa5a0aa9c99d4e9311b9a2b343561f7d159a32a39179ae2b36ed431
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with at least one, 'https://leonvi.ru/award?keyword=bureaucratic+theory+of+management+pdf', pointing to a suspicious domain. The document body, though heavily obfuscated, suggests a lure related to management theory, likely to trick users into visiting the linked sites for phishing or malware.

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://leonvi.ru/award?keyword=bureaucratic+theory+of+management+pdf PDF link annotation
    • http://profibrend.ru/83812673155kp8co.pdfIn PDF document text
    • http://smeshnoykir.space/57599788801dk0t9.pdfIn PDF document text
    • https://cdn.sqhk.co/dedejosewor/hKhjLK9/gonokiwipemunole.pdfIn PDF document text
    • http://naturfresh.space/kindergarten_report_card_comments_for_bad_behaviorpprzb.pdfIn PDF document text
    • http://creditactive.info/dezopitobuxudekebuwisodoz5t1e.pdfIn PDF document text
    • http://lalat.space/mecanica_de_materiales_beer_johnston_7ma_edicion51zux.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/hh66jdG/space_army_jetpack_arcade.pdfIn PDF document text
    • https://cdn.sqhk.co/gurudulep/jgOibjf/luxeg.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/ac8cfccd-4507-4973-88c0-20a71b7c9ea9/85330499746.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222e753d-27b2-4c61-9a15-7a82b3a19576/vizizoxipesezupokejiko.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/angry_birds_rio_mod_apk_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/81345211509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e1c845-56f2-448c-978d-6504b9e4b653/jivufigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/480c11fa-c9d4-4894-8bc9-81810045623f/how_to_change_a_filter_on_a_fisher_and_paykel_fridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d8b4b25-4edf-42e1-903b-83c378c1e8db/the_little_match_girl_summary_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/how_to_check_car_seat_expiration_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ce7e02-280c-4330-8ce4-f2a7fa8bb9ba/48711895327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad80607e-b83b-40b8-9c9e-38a3bdeb30bd/12906894029.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_off0000fb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 5512 bytes
SHA-256: 226c83b72888284234cfddb6c5abbcc6c1ac3010a0f9a6fe4248f545f7d86305
font_01_sfnt_off00010df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 10324 bytes
SHA-256: bdc21b90314db00868318980482f6f0f3a23192e34d6ca9847e0f9762b1b175e

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