Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf21253f7c6665a…

MALICIOUS

PDF

80.4 KB Created: 2021-03-16 22:00:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f21cc084ff859fecc6d40480c4e6d1de SHA-1: 9f85f3fd6c257fbeb8505d6dc506bcf9fbadda6c SHA-256: 7bf21253f7c6665a5965795d0048e9a32ad51dfad07397a732232f7de83b2dbc
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

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://nipisod.ru/award?keyword=baciloscopia+procedimiento+pdf PDF link annotation
    • https://cdn.sqhk.co/zodenizekija/icjhBiL/top_mobile_marketing_companies_in_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/esiff1r/bosch_laser_distance_meter_service_center.pdfIn PDF document text
    • https://cdn.sqhk.co/bojiluxenome/8jaibax/93503724825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_60399738a8cb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390663/normal_604a650bb2f13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393369/normal_601d33c8a1f95.pdfIn PDF document text
    • http://itrom.fun/husqvarna_viking_emerald_116_sewing_machine_for_salenqzgm.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/40690859373.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/fagatobo.pdfIn PDF document text
    • http://dfds.in/lead_like_jesus_study_guide3cv9o.pdfIn PDF document text
    • http://kupivse.xyz/jiffy_lube_portland_near_met8kap.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/gczD0ge/the_island_survival_challenge_descargar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380214/normal_5fed46c6ae780.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_5fdc3327a9ffb.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/how_to_use_iphone_11_camera_settings.pdfIn PDF document text
    • http://chistohome.moscow/milady_cosmetology_book_2020s6hyi.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://f0d491a7-7d72-4eea-bbd3-72ad31f48a9a.filesusr.com/ugd/1acdab_a97bc6601efc40ffb367450311a49af7.pdf?index=trueIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_6cb5c757cd6a450fa5dc9ca6d535db73.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_4717d5d7b61d4d64a8ec713c9a6a14c8.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_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 5136 bytes
SHA-256: 68ab349becd03b2b576a5d90e278c3aab539e6f44e0e630dbf41163479f2ea2c
font_01_sfnt_off0000fd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD95 12108 bytes
SHA-256: 9cbf471d0c34462dfb8084f9b429b850cf349aa31f04a6bcd4c97ec4ba97127c
font_02_sfnt_off000124f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F4 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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