Malicious PDF — malware analysis report

Static analysis result for SHA-256 f155093872f598c5…

MALICIOUS

PDF

88.4 KB Created: 2021-04-16 16:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b1e9213c662cf0bc6ed0072fea958d8 SHA-1: 9b9793398a0b0375f35ec4891e794e6618c4ff2a SHA-256: f155093872f598c55ad34e77e30ddc03d5f3f7dffa28de57e91b63e1e3bba7e5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://kuzutuzo.ru/strik?utm_term=fishman+loudbox+mini+bt+songwriter+package PDF link annotation
    • http://zofiziz.getenjoyment.net/fomupoguji.pdfIn PDF document text
    • http://suwefazimim.medianewsonline.com/gisegilojimadurofade.pdfIn PDF document text
    • http://latencfsrt.space/74109572050f3b9k.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/2000_ford_ranger_replacement_rocker_panels.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/volumes_of_cones_cylinders_and_spheres_worksheet_answer_key_kuta_software.pdfIn PDF document text
    • http://ins.expert/jebizojomimopovivimulegin1d21r.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/some_social_issues_in_tamil_nadu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7b310c-8fd5-4600-aab1-cb6c43409c08/acer_swift_says_no_bootable_device.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/avengers_endgame_toxic_wap.pdfIn PDF document text
    • http://wurebosuloxu.myartsonline.com/caballo_de_troya_7_gratis.pdfIn PDF document text
    • https://d7301f0f-9730-4f6e-9d95-601e203cb770.filesusr.com/ugd/253413_56f09b60809c425ca0cc880ce4ef80b0.pdf?index=trueIn PDF document text
    • http://woranuganavot.myartsonline.com/3843170514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c5ef4f-7f8a-4b8e-abfa-901c7125ad72/naduf.pdfIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_38effa5e7d8d41778bf8b1460f26e4e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/sigmund_freud_psychoanalysis_book.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/jusikiruxufaxexevozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3fe553f-9e42-457c-a37a-06a4430cf76b/vosewozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d1b196b-0133-49a5-aa03-2074cab3e334/10268865740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/506b7da3-c38e-46a5-b096-754b9ac9a0ed/36837792275.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_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 5808 bytes
SHA-256: e3cdb4544b774c70b20adce78de950eead97084fd4203564a786d1ca16285207
font_01_sfnt_off00012c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1B 11324 bytes
SHA-256: 8d09e57d071b2f845b1eb9cbddfabedd5c0d7bcbe14640b1b339080d87b595d7

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