Malicious PDF — malware analysis report

Static analysis result for SHA-256 b489f987bbe66490…

MALICIOUS

PDF

70.2 KB Created: 2021-04-12 23:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 744371f5243681fd6d26b5c853db517f SHA-1: d63d16556041c83e5343193be587ffebef41308f SHA-256: b489f987bbe66490f751e3ff52ec42cbe17fd79c2a2176097c2724bc62eddf57
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('zajinet.ru') that appears to be part of a link farm designed to redirect users. The document's content, though heavily obfuscated, suggests it is intended to lure users to external sites, likely for phishing or malware distribution.

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://zajinet.ru/strik?utm_term=delta+shopmaster+10+miter+saw+blade+change
    • http://getallcreditscores.info/historia_del_escudo_de_costa_rica_resumenc5o1n.pdf
    • https://xufizuwerab.weebly.com/uploads/1/3/0/7/130738786/gupalakoga-kokuliz.pdf
    • http://xurixekan.22web.org/gewatafinigiwopilasitejim.pdf
    • http://podeves.xyz/mr._rebates_cash_back_savings_bankb7ib7.pdf
    • http://zoosalon.org/fofitejirim5dtbb.pdf
    • https://xizuxikeg.weebly.com/uploads/1/3/0/7/130740292/vigigagopitop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_a347aec3362541e9a615e7e77054fffe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8647eb21-c56f-43ff-8153-d1933905f5f8/6643084963.pdf
    • https://uploads.strikinglycdn.com/files/e206acfa-58ae-4d78-b7ba-70df8cdde4c2/50909417430.pdf
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_67b37679cd4c4d0d93ba06760b45b50f.pdf?index=true
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_097f89ba40cb4988ba7d8a0b1485cff8.pdf?index=true
    • http://ponowuvibux.epizy.com/xakomopomuxofurugop.pdf
    • https://uploads.strikinglycdn.com/files/71da26b8-8336-4bce-811c-c40f42182cda/gran_turismo_6_ps3_cheat_money.pdf
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_2978e579e5794f7fb14e2d2d9a0ea694.pdf?index=true
    • https://uploads.strikinglycdn.com/files/659cb8e0-8013-4223-a377-94dc1e9efc8f/dream_interpretation_snake_bite_on_back.pdf
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_1050f657b9db4e50a21c7cfca342a0a6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e8461cd5-0249-4ef1-92dd-83490f7adfdb/how_to_renew_a_learners_permit_in_arkansas.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_off0000d18c.bin
80b88f808d690d3f95c5beaacef4eab07c3eb1b4be836cde8dc994d10058570e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 5912 bytes
font_01_sfnt_off0000e595.bin
4fbf4d7dad6762d7f913266bf39f3afa77d235159421177e7c147930f2032067		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 10508 bytes

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