Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaab75485f29f83…

MALICIOUS

PDF

79.8 KB Created: 2021-03-04 21:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fd10be6f67e5ff8e5303d01444688378 SHA-1: 08090e11c056d24cd15b29925d1566c8f5b6fc48 SHA-256: cfaab75485f29f83eeb0b9c491469ffb04d8c4e03728634419f40a891f314f97
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one heuristic flagging it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

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://druttle.ru/wix?keyword=glencoe+health+chapter+12+worksheet+answers PDF link annotation
    • http://fherixq.com/list_of_cars_characters_with_picturesox4ul.pdfIn PDF document text
    • https://cdn.sqhk.co/pejibuti/SicNjjX/word_stacks_level_3927.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489595/normal_5fe411e30c287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495854/normal_6035d792d45d3.pdfIn PDF document text
    • http://myimperfectmomlife.com/expedia_travel_guide_videoscc5v5.pdfIn PDF document text
    • http://mujepojubum.22web.org/xapabedisukavemojewe.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/aidjfT8/teacher_assistant_in_florida_salary.pdfIn PDF document text
    • http://marketes.pro/befemived8rjz.pdfIn PDF document text
    • https://cdn.sqhk.co/fakujodi/exc1jeq/drag_racing_wheels_5x112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_6024872d90478.pdfIn PDF document text
    • http://xezosejosofof.iblogger.org/96860316217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_6033b5103cab5.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/4127e4b9-92b7-4ca6-bc7b-6218809c580f/air_force_academy_football_bowl_game_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e175079b-1042-4f15-b0c5-93253916dd93/22505292687.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58ff303c-c1ed-4c7f-8c31-05b67df3805d/bright_starts_bounce_bounce_baby_assembly_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa401979-4335-403e-9511-02d512c57f62/74847851704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70559a8c-9010-496f-8b28-06a11a6582b3/46952202141.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_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 5392 bytes
SHA-256: 447eb4fe9aec6919cdbe3bebdcc690eaa65a3ddc27923c18f241d471b959f0d8
font_01_sfnt_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 10916 bytes
SHA-256: c8366e0b34de68a662d4946901cf070366d5599ca5c1be03e57a7249c6a9b22b

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