Malicious PDF — malware analysis report

Static analysis result for SHA-256 954314fa4a425dbe…

MALICIOUS

PDF

76.6 KB Created: 2021-05-17 13:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3955570f2e5068117b64a81c4121fefc SHA-1: a82c5f42c0a7bc938464d32e9e1469444e29ec2f SHA-256: 954314fa4a425dbeb613b0736f6ee712ba89820a97996a3e0d2ec549f1cc063e
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it, many pointing to disposable domains. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier and ClamAV detection further confirm its malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=predictable+revenue+pdf+free
    • https://cdn-cms.f-static.net/uploads/4477400/normal_604187d6ecf44.pdf
    • http://matizaw.mywebcommunity.org/capitalism_and_schizophrenia.pdf
    • https://fufuwotasivixi.weebly.com/uploads/1/3/5/9/135966690/2031640.pdf
    • http://rajajime.mypressonline.com/jerobutidimojilu.pdf
    • https://bebiluredop.weebly.com/uploads/1/3/3/9/133987060/nefozovuv.pdf
    • http://katipef.medianewsonline.com/50852728335.pdf
    • https://cdn-cms.f-static.net/uploads/4485578/normal_606b8a8e1a7fb.pdf
    • https://nafepamozox.weebly.com/uploads/1/3/1/0/131070284/sepomisamatir.pdf
    • https://najigojuvunijo.weebly.com/uploads/1/3/0/8/130874658/5655748.pdf
    • https://vowuzuvave.weebly.com/uploads/1/3/4/8/134884034/8eff51c33.pdf
    • https://cdn-cms.f-static.net/uploads/4417141/normal_5fd6a6f280c9b.pdf
    • https://cdn-cms.f-static.net/uploads/4462708/normal_5fd5f1ecac2d4.pdf
    • http://bibivire.mygamesonline.org/sevojifago.pdf
    • https://cdn-cms.f-static.net/uploads/4470521/normal_60357f2b2c327.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e714dd98-3e42-4604-aba1-6d4b2506b1a8.filesusr.com/ugd/742965_3226b2675d554f6faff2fdcd4f8b494f.pdf?index=true
    • https://s3.amazonaws.com/suxuzubojut/tajoj.pdf
    • http://seretavezoduriz.onlinewebshop.net/patterns_of_enterprise_application_architecture_free.pdf
    • http://xunudijumo.myartsonline.com/55269343686.pdf
    • https://57ead060-d7b3-4f59-a803-6c9b47c0028a.filesusr.com/ugd/f30481_a5fa5fffe7c94a10b0a997c072251752.pdf?index=true
    • https://s3.amazonaws.com/jidagafinuxesu/pazemokafivife.pdf
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_ddc4641994f146e784ac6874abe765dc.pdf?index=true
    • https://s3.amazonaws.com/verirejon/what_are_some_uncommon_idioms.pdf
    • https://s3.amazonaws.com/biwubeleba/11090159228.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf4.bin
6b11b3b9bd1e77f628746cf5f1494a2551d62b3b8246fe34c151d1432cf7f023		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 5172 bytes
font_01_sfnt_off0000fd9d.bin
371709621b2c2a8304ea3fe16b9dd4a88bc3dbce1a9e98bf20bcafa04c827068		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 11516 bytes

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