Malicious PDF — malware analysis report

Static analysis result for SHA-256 c508cef034c9fcce…

MALICIOUS

PDF

72.7 KB Created: 2021-03-28 09:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0f9855ca109e744ee3372454ad031781 SHA-1: 5ec484d8c83bdacfbe322688cf03262bac1f70c4 SHA-256: c508cef034c9fcce86fce6d61cd8ec1f450432efabc90ff4da0fd3954410b90e
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 0.9991

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://seumenha.ru/123?utm_term=alleyns+sixth+form+open+day PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410459/normal_605421a0c03ce.pdfIn PDF document text
    • https://mebolosedam.weebly.com/uploads/1/3/6/0/136009811/nitosivixitamuruleni.pdfIn PDF document text
    • http://plusstore.pro/nebazaszfn4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365656/normal_5ff94fca29d8d.pdfIn PDF document text
    • http://allieshouseofhope.com/western_civilizations_their_history_and_their_culture_brief_fourth_editionh623h.pdfIn PDF document text
    • http://rmk4sale.xyz/wolf_of_wall_street_quotes_funny13q42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448357/normal_601c873e34e93.pdfIn PDF document text
    • http://nukicew.xyz/pinball_wizard_bass_tabadqmj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481540/normal_5fe829aab73b9.pdfIn PDF document text
    • https://refedekejevejat.weebly.com/uploads/1/3/4/3/134312363/19975.pdfIn PDF document text
    • https://dofisizowi.weebly.com/uploads/1/3/4/3/134327642/nasitasatefewapis.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/simulation_with_arena_6th_ed.pdfIn PDF document text
    • http://flymoney.net/vezafavoxuvakebosa1b0.pdfIn PDF document text
    • https://xipinirobidojuv.weebly.com/uploads/1/3/4/0/134017625/92a199974de22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widepidaba.atwebpages.com/53797362149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab641e68-376b-4c0e-88fd-5be3ae635651/58678528400.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/zizulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5859de6-580b-46a4-9533-e0188d61eda9/mulimifimakarabazebomenir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10035777-17b3-4c60-9902-ff51b86e6cf4/24309457268.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/template_undangan_khitanan_png.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/26753836898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0918fb97-0d95-4f6b-91b7-e85f6a1207b1/stealth_cam_trail_camera_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/updated_beneficial_ownership_certification_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a131082f-075f-48b0-9412-a1a971bafcd8/red_dead_redemption_2_hidden_achievement_list.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_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 5440 bytes
SHA-256: 029e3f8aa7f271caad47f7d10ab23768b208415c5a0b1f6dd800e5a70df4fd7d
font_01_sfnt_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 10380 bytes
SHA-256: 2b0d98bba26084101c3a8963208ca041fc169b24d826c2d5ca57ca8b8561b700

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