Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec160990995f5a0…

MALICIOUS

PDF

76.0 KB Created: 2021-04-30 11:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dc98564b274d8f7dd025260de69ada14 SHA-1: 7595f112acf5c2f3828136acc10f115671fd168b SHA-256: 9ec160990995f5a08f74112ed28b489ae05b9134e277af5ff84edb86823f3000
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the file, indicating it is likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://baarspo.ru/strik?utm_term=ibn+kathir+books+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4458827/normal_60102773c3fdc.pdfIn PDF document text
    • http://salonapp.xyz/76540016893xp6wo.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/Ehfgchi/38305133566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462354/normal_601884fc80859.pdfIn PDF document text
    • http://scandisvet.ru/intermatic_pool_pump_timer_partsaurd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5fcbfbf350865.pdfIn PDF document text
    • http://cethq.xyz/aankhon_mein_teri_songs._pkn30t2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383917/normal_6018e9a029419.pdfIn PDF document text
    • http://jolijivik.scienceontheweb.net/adobe_place_signature_greyed_out.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/cv_of_civil_engineer_fresher.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/hoigP4X/jelipotos.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/Phghcii/10230560267.pdfIn PDF document text
    • http://rasprodavaika.ru/how_to_be_like_king_daviddyqq0.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/1yxggrf/subway_surfers_online_unblocked.pdfIn PDF document text
    • http://gachihyper.xyz/kofekugosimaxewc2x8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/guvovigo/68812651943.pdfIn PDF document text
    • http://rixigor.onlinewebshop.net/ncert_maths_book_class_5_solutions_free_download.pdfIn PDF document text
    • http://teropisarazo.myartsonline.com/fekodax.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/46867959152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ccb8571-9a22-4527-9b12-0a435fef52a9/can_i_rebuild_a_pressure_washer_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11d5f55c-dd6a-42c1-8afd-692fa720a14c/22503602086.pdfIn PDF document text
    • http://jemukiguwuw.myartsonline.com/47830814227.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/beyond_compare_mac_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e7c29a1-54f8-4d63-a293-4daeb7a21bc0/gulewifotupafun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/370ae172-3887-48df-a778-2350308d8d1c/15508458732.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_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 5360 bytes
SHA-256: 53631b4def55ef7a4f1a082bb207cf039fe0ffb8ac2dc6d15f91778cd7b2aab8
font_01_sfnt_off0000fd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 10884 bytes
SHA-256: 1245d0a58170fe448b8c0adcc51dbb464fdfc44b7b52d0e2e89950bdf8190655

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