Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4b8cd6b3b1cd4e…

MALICIOUS

PDF

85.4 KB Created: 2021-04-26 07:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 28036116649073380c47d0509fb0b1f5 SHA-1: 8c1bab307c751e2c9a6189e397a7db836d4fd44d SHA-256: 9c4b8cd6b3b1cd4e85dc1a6a3c0ec4b6374fba47bcbcdfe676c3c13cd1f34fdc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=behringer+xenyx+q1202+usb+driver+download PDF link annotation
    • https://cdn.sqhk.co/gavezexu/R8hjUv3/real_fast_followers_likes_mod_apk.pdfIn PDF document text
    • http://probmake12.xyz/how_to_make_homemade_touch_penrd9cw.pdfIn PDF document text
    • https://cdn.sqhk.co/vikeguzag/Bjdj8ph/2791545176.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/Bib1jbC/fun_basketball_shooting_games_online.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/el0bbhd/5950074697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470224/normal_5fe84169a5445.pdfIn PDF document text
    • http://discount50it.pro/tefulegcc5qt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_606625605b5e5.pdfIn PDF document text
    • http://idealsit.space/alucobond_a2_technical_data_sheet411sp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_69942c9eda5e4d50b28af55ec550c9a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e6ebe6-6df6-41ef-af87-130076dbb5bf/how_can_i_share_a_word_document_on_facebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4358a9bf-1219-4881-a2d6-416716aa9efa/34864080134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9081d777-25cf-4b5b-84f4-0e8b0bdfd9ec/how_to_crochet_a_hooded_scarf_with_pockets.pdfIn PDF document text
    • https://5de9ed01-d610-4143-94db-6f998645a8ce.filesusr.com/ugd/1d8bf6_fbcf15fcc7254877b8fe8139a459559a.pdf?index=trueIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_ee29b0cb3787408cbf6358f05d916ce8.pdf?index=trueIn PDF document text
    • https://d85b1738-a471-4043-b59e-116b2bb794a3.filesusr.com/ugd/97927e_3a75702adfd94cd6bdb5e48dd7241424.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_cb83ab59b234425b9f0a25878ab6a8a8.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_e01df2012def4e26b4ebf88dd71b75d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b0a1461-4aa3-4451-b259-9de5e7f81e9a/kijijedimogajejafetepum.pdfIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_9db2217618cc42f783d80fdf7b7f8b2f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 5852 bytes
SHA-256: 76123463bd439709b8f668dfa4c0498187f53ab0ed5e51185e8ec8fb041cbc3a
font_01_sfnt_off0001145c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145C 11072 bytes
SHA-256: 6abda5dee05e55a5eb00f9f31353ab63318549dc73bc76c2c2ef904bf2772f36
font_02_sfnt_off00013a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A26 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2