Malicious PDF — malware analysis report

Static analysis result for SHA-256 5316d2985714981a…

MALICIOUS

PDF

82.8 KB Created: 2021-03-30 14:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05323578c8bdb4e67e5f2cdc74b4f389 SHA-1: df564597662576073c59b59441736248743e69e1 SHA-256: 5316d2985714981aec80c83b907e4018aff0281fee86bb3d49d123af34e2ef5d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as a link farm, containing numerous external links to other PDF documents hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or traffic redirection. No scripts were extracted, and the document body was heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cdn-cms.f-static.net/uploads/4446155/normal_601b2c65c5923.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412774/normal_5fd672dbd9f08.pdfIn PDF document text
    • http://cyberlife.store/gowejuvepipamibn97b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464532/normal_603f5bf5b7a05.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/fixexabewanpjbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_602898148e173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_601b35cb304c4.pdfIn PDF document text
    • http://buloshnaya.site/33819378087cipdm.pdfIn PDF document text
    • http://titoto.xyz/altered_carbon_book_vs_show_season_2kkt24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366325/normal_5fc9c3191d16d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403817/normal_600ff7a66cd4d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Xr6F2PkPTcg/wb?keyword=is%20today%20national%20pet%20adoption%20dayPDF link annotation
    • https://uploads.strikinglycdn.com/files/bd4cb7db-8b74-4bfc-ae90-e4bb23c45e17/kenmore_elite_microwave_convection_oven_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c66977c9-ee1d-4229-b903-714dbf0b8cb5/razer_blackwidow_elite_keyboard_software.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_85834e78aff84275b70e4f1a20fbeaa7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe88101-3990-4d42-be99-e6132a2cd8d1/how_to_change_alternator_2013_dodge_avenger.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_51ddfd705bdc4c23810ddaacad7fd65e.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_6f20a0053bb845b79107c826c4851c66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/770154a6-cff4-4f2e-b9b9-f6676a29de2f/72288366929.pdfIn PDF document text
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_8143bd76b2e340d1a600c7d94533cf01.pdf?index=trueIn PDF document text
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_c1307f25db794bd8a1beb52513c4d88e.pdf?index=trueIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_bb4b7aed686a41a0aa4cdef958b64b7c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22a9313c-0221-47ef-b517-23bd888fd61e/nemiravosubilitu.pdfIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_a664917bf5bf44d2a001ec136d484e9b.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_c8673a31a3ce4efa96278f342599dcff.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 4896 bytes
SHA-256: af9cbc2118f2890616725ae0006fd27e876de48f9b12ad49cbb40da8617c6d30
font_01_sfnt_off000117b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B2 11096 bytes
SHA-256: 83ca68282aa4cbf7c14370a5efe5e9d5e1726b673e8bc6be543dea105058156f