Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b48df3ae62898f…

MALICIOUS

PDF

74.9 KB Created: 2021-03-15 17:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55a3c09876b553bc3e488a9a93941e3b SHA-1: 973478ba1ff9a39b40da6b7d613b40ff3f4a4b33 SHA-256: c7b48df3ae62898f9851f88c1f8c11814cb148fe0292fd72f0dc07911a67453c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are SEO-focused and point to other PDF documents, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/wix?keyword=amazon+delivery+driver+drug+test+uk
    • https://cdn-cms.f-static.net/uploads/4448740/normal_5fda5e542e35b.pdf
    • https://wujupeduluruwuv.weebly.com/uploads/1/3/5/3/135316277/95408.pdf
    • https://cdn.sqhk.co/bosamame/rLX5ibu/wifezekotanipodu.pdf
    • http://sk-anker.ru/7374685987lltov.pdf
    • http://erogan-oficial.site/hoover_windtunnel_2_rewind_pet_belt6pjec.pdf
    • https://cdn.sqhk.co/ruvonusebex/heichih/turomavuwoborejofalaz.pdf
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5fd11b80347de.pdf
    • https://cdn-cms.f-static.net/uploads/4481275/normal_60159aba9cb19.pdf
    • http://shoop-fo.ru/jetutuvurejesixefaresusbvpik.pdf
    • https://cdn.sqhk.co/revogonesox/vX0ij2c/64877765858.pdf
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/3283928.pdf
    • https://cdn.sqhk.co/sofizagumup/aMlZWUh/zabomijutapuvuse.pdf
    • https://cdn-cms.f-static.net/uploads/4380854/normal_60126fe1dec5c.pdf
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5fe33342051f1.pdf
    • https://cdn-cms.f-static.net/uploads/4470218/normal_602d94cd9d9c9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a3afb7de-a0ff-4924-b498-c90ae8e8ea92/why_is_my_maytag_neptune_dryer_beeping.pdf
    • https://uploads.strikinglycdn.com/files/d43043fd-f1c5-4194-a5e5-da31df608b8a/oil_capacity_of_honda_gx390.pdf
    • https://uploads.strikinglycdn.com/files/3fd2bfae-100a-4197-a409-1d26aae20535/the_wrath_and_the_dawn_duck.pdf
    • https://uploads.strikinglycdn.com/files/faac20c9-0698-41ee-9e72-8a6838b266b3/the_christmas_carol_movie_1938.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e666.bin
ec25fd1f36a1dfc7b05e65921e59d831c6522a4c2473b802c9d886fe8383f66f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 5408 bytes
font_01_sfnt_off0000f8ce.bin
da102ba89ee502a0b3de0a0cf1ff1c4c8dec28a3f00c74fe0de3358979d2e3d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 11168 bytes

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