Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca8f32fb4e2e221…

MALICIOUS

PDF

89.8 KB Created: 2021-04-05 11:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 334ffcdac9b2a19761155eab44225d80 SHA-1: 57b1f3238bd13ba5278e74c1dbc96fc4725b66e2 SHA-256: 8ca8f32fb4e2e221c26e83ac0acf49d7c46631bf4b2aeaadd742fa31e60808ad
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://jacksth.ru/123?utm_term=informe+de+auditoria+interna+contabilidad PDF link annotation
    • https://gonelato.weebly.com/uploads/1/3/6/0/136082396/zikolu_verosa_matosasevulo.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/zojejadigupixuzo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426953/normal_5fcdfd9e811dc.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/96134917635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470540/normal_602c57d9f23bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_6021ce8bca873.pdfIn PDF document text
    • http://kedamijofulufep.mygamesonline.org/endocytic_pathway.pdfIn PDF document text
    • http://lejidakoxinetog.mywebcommunity.org/the_biography_of_bill_gates_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410414/normal_60026f8e7e74d.pdfIn PDF document text
    • https://dawurawo.weebly.com/uploads/1/3/5/3/135323901/bawotoketotatetar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_5ad4ef4cb5364561b9a6ad6f983bfdbc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juvosi/66380749352.pdfIn PDF document text
    • http://duziroro.myartsonline.com/what_if_marvel_episodes_names.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/arthur_koestler_the_thirteenth_tribe.pdfIn PDF document text
    • https://30372bae-fb3d-4285-bee0-d91e70c22047.filesusr.com/ugd/835091_da9c28dd325341cf91b8cb172b5dc065.pdf?index=trueIn PDF document text
    • http://kutoxinupuroxo.onlinewebshop.net/ge_proficy_machine_edition_9.5_programming_manual.pdfIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_f6d0189ef7e74ad6b18fd8e64d60e759.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_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 5068 bytes
SHA-256: ef2143654cc892f2eef5f30b4a1f9539384c8be406091bafe7f5a8a5186d904c
font_01_sfnt_off00013248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13248 11704 bytes
SHA-256: 82e195b6507e0f8dc36de41cecff9d48d576edffe8d74204a8922e7d8d220809

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