Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd11f42e3205e238…

MALICIOUS

PDF

78.4 KB Created: 2021-03-18 16:31:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 17c2905a6addbe356dfe8166c5041067 SHA-1: 5b50ccbda8b2c2bbdc2dd0c8f07b3643eaaaa9c1 SHA-256: fd11f42e3205e2380e1de77550756fe933589a084f63c0450b0df21903ed1f4d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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.
  • 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://vilenefex.ru/award?keyword=video+editing+textbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485823/normal_6016275c8453b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409819/normal_5fcc5eedca39b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464542/normal_604cb65b6eba7.pdfIn PDF document text
    • http://extraterrestrials.space/articulaciones_del_craneorzb2j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417543/normal_5fd7be97b4fa7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490252/normal_60490cb654353.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/pivitoguko.pdfIn PDF document text
    • http://servempieza.site/mozuregilibabipegesibedilqf.pdfIn PDF document text
    • http://1xbet-regi.site/checker_plate_sheet_steel0fj87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500670/normal_6045bb60330fd.pdfIn PDF document text
    • http://giwudogor.scienceontheweb.net/adverse_selection_in_health_insurance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gurabagoderes.atwebpages.com/dewalt_3000_psi_pressure_washer_for_sale.pdfIn PDF document text
    • https://2e9d2e4a-15d5-4529-8b29-235aceea4e08.filesusr.com/ugd/cac96f_91d75f47277945d4b2829ba14b39fca3.pdf?index=trueIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_aa074c95fe6f4fa4bdc3c7aa4720fbdc.pdf?index=trueIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_1a937e60644743d1b632e51df59a8d0f.pdf?index=trueIn PDF document text
    • https://9e2b3e3a-6a02-4d3b-8ba9-5acc01041672.filesusr.com/ugd/66c878_ee8046e3a14042ce8020539151563000.pdf?index=trueIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_bbe1f8bd371347409226a6c403f71c06.pdf?index=trueIn PDF document text
    • https://f3c4034a-4a94-4c47-b6c5-0445626d7bf8.filesusr.com/ugd/655f09_ff5fc3899fee43aa8e5b28551a5a6912.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_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 4928 bytes
SHA-256: 98c263f4dc00c8345e9d03eb29cbf7f12a86476cccb4f5c98e359493700fb533
font_01_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 11496 bytes
SHA-256: 5e27962d8b2e9df289492d2aa973a587fd9340e6891004c486f6e97bdaa8ab32

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