Malicious PDF — malware analysis report

Static analysis result for SHA-256 17c85d4f104ba884…

MALICIOUS

PDF

72.6 KB Created: 2021-03-30 04:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ed11773fde8825fe6cf0ff90f53965a SHA-1: d60893d6c34dd851fca9f7e3efd4278b0e719969 SHA-256: 17c85d4f104ba884657d3ea47a690a2f9dc03e8a25ea7367b9e82a86f198cd42
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or phishing attempt. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The embedded URLs point to various domains, including 'vilenefex.ru' and 'pocki.top', which are likely used to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=functional+analysis+problems+and+solutions+pdf
    • http://pocki.top/free_animation_app_for_ipad_pror246x.pdf
    • https://zujususo.weebly.com/uploads/1/3/4/6/134615591/e42881763e91d6a.pdf
    • https://loxutagunepolu.weebly.com/uploads/1/3/4/7/134763456/wumisiwu.pdf
    • https://static.s123-cdn-static.com/uploads/4368969/normal_6006fbaaa9859.pdf
    • https://cdn.sqhk.co/novoganug/geiahge/64615290992.pdf
    • https://cdn.sqhk.co/wajerewuwer/KIhg83D/best_zombie_infection_movies.pdf
    • https://cdn.sqhk.co/pubisifibuj/fhcPMgd/gaguduvirogodasapufileku.pdf
    • https://cdn-cms.f-static.net/uploads/4458856/normal_602bfbf589967.pdf
    • http://xplaintome.ru/puzodoluwajemavakibeunw5l.pdf
    • https://cdn-cms.f-static.net/uploads/4410433/normal_6024f34125f5f.pdf
    • https://cdn-cms.f-static.net/uploads/4409420/normal_605f664cd3d5d.pdf
    • https://cdn-cms.f-static.net/uploads/4419003/normal_600c8d1f3ec1b.pdf
    • https://latibexuwer.weebly.com/uploads/1/3/0/7/130776356/1285764.pdf
    • http://nubolats.xyz/jekanujerakufoninemusumrypct.pdf
    • http://salestore.pro/nakipazosar0jxok.pdf
    • https://cdn.sqhk.co/vozaxodep/igHtvgd/xfinity_race_at_darlington_results.pdf
    • https://gejosubirimo.weebly.com/uploads/1/3/0/7/130776575/pitajusonupipe.pdf
    • https://cdn.sqhk.co/venifirub/iighcvy/multiple_discord_accounts_at_once.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_701bab6089c841019d7528897c4ec140.pdf?index=true
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_da5bb577a7434e4c832855fa8bdf54cb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cd5afd1c-7b5e-4749-9b51-aa0cc13854ce/bunanijixetetewor.pdf
    • https://uploads.strikinglycdn.com/files/66b95b6d-b56a-4c57-82f1-22b8429bc446/petasidosowibikonesevuve.pdf
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_0abf2d0160fb4a7f8f467c1c3f7506ea.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9ae731a8-29ba-4b99-bb3e-5cd11028be50/4225543183.pdf
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_ca35674651a64cf285aabfdb95d1d43e.pdf?index=true
    • 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_off0000dd23.bin
5586fa7bbbb01b3bf5bbdc73cdaa8e6840b84335956cbf957d1211b0391fef53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 5496 bytes
font_01_sfnt_off0000efc1.bin
e2391affd2b9e4218be8bfe2232912af3ec9fec590386ba84f684c0fb252eddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 10644 bytes

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