Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20a6a0d2ed5e28f…

MALICIOUS

PDF

84.3 KB Created: 2021-05-02 23:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: be72f736c5a80f7487bbde941d41a231 SHA-1: 936eced633ddf42a55786dfeac53ee472c79fa72 SHA-256: f20a6a0d2ed5e28fade53c9577ce596d5028add85758d301a17f58ad4f9c9a30
126 Risk Score

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 0.9970

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=lincoln+electric+pro+mig+140-amp+welder+for+sale PDF link annotation
    • http://xasedogamif.mypressonline.com/70449529189.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/93764809658.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485580/normal_6002e176b45c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369764/normal_5ff34c229b4b2.pdfIn PDF document text
    • http://kafalukuwemi.mygamesonline.org/bardavon_health_innovations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366029/normal_60223e955bd10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_5fe7524f013d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392873/normal_5ff04a133544d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_6013e81fa57fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373788/normal_5ffcdc34e7870.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/how_to_turn_on_weber_grill_spirit_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_60584c7114283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_603f6a4ec8762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_6047e15957803.pdfIn PDF document text
    • http://zaxiluxedexu.getenjoyment.net/printable_hand_lettering_practice_sheets.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/nalijexurejuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_e3010a9326b240f3888a87b6854d2e15.pdf?index=trueIn PDF document text
    • http://somifisuvukibuk.onlinewebshop.net/bookworm_books.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/dorafixedikajubawuxapif.pdfIn PDF document text
    • https://b585a76b-fab5-4024-b0d2-f3ad95444197.filesusr.com/ugd/404203_df1ec5a7c4684c8289a5f4d864791243.pdf?index=trueIn PDF document text
    • https://42cc6f6d-9125-48bc-bce4-1bf15f49b1be.filesusr.com/ugd/7c30af_94cdb3e8868648e7893f89576e9f70ea.pdf?index=trueIn PDF document text
    • http://vokesakogo.onlinewebshop.net/como_aprender_ingles_escuchando.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/nemirika.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/98898071630.pdfIn PDF document text
    • https://s3.amazonaws.com/novipaliwid/tajewexozadinusogor.pdfIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_f7dd3d2004524b8eb0fc0abbec53ca2e.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_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 5820 bytes
SHA-256: 4c5d514201eaf9cb794a88759a78d5ecd24ed834f28422c9461c010946a8b7e8
font_01_sfnt_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 12172 bytes
SHA-256: 8a6df200b95c29fd29ff483b3a45b1d94b9aef210fbd93d7df8f470c78066287