Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e4ebb899a1f48d…

MALICIOUS

PDF

76.7 KB Created: 2021-05-20 16:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef8cbcfca2d5397f7264350f2982fd47 SHA-1: 7cc17f1650547d797c88a0c3a6a83bc146df035d SHA-256: 68e4ebb899a1f48d643aa9b28baa279ee8c0c8d31d09d957fae5bdda626ced29
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or phishing campaign. The primary URL, 'https://seumenha.ru/strik?utm_term=ran+kulakukan+semua+untukmu+cover', is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=ran+kulakukan+semua+untukmu+cover
    • https://venozosuvizulul.weebly.com/uploads/1/3/0/8/130814909/118653.pdf
    • https://kigusokitog.weebly.com/uploads/1/3/5/3/135300221/28c769d62005.pdf
    • https://cdn-cms.f-static.net/uploads/4490132/normal_60379b5066cfc.pdf
    • https://static.s123-cdn-static.com/uploads/4405437/normal_5ff347999dc7d.pdf
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/9f68b2846ebf94a.pdf
    • https://sulogaxelope.weebly.com/uploads/1/3/1/4/131438888/997905880041.pdf
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/710079.pdf
    • https://vijapuloxo.weebly.com/uploads/1/3/0/7/130775263/ruzumevumel.pdf
    • https://lodavoxi.weebly.com/uploads/1/3/4/5/134505118/9527919.pdf
    • https://static.s123-cdn-static.com/uploads/4409092/normal_5fc9dadb75437.pdf
    • https://cdn-cms.f-static.net/uploads/4468871/normal_60293ef9e5dbd.pdf
    • https://cdn-cms.f-static.net/uploads/4501042/normal_606bc88f588e7.pdf
    • https://cdn-cms.f-static.net/uploads/4423137/normal_6029db7c637fe.pdf
    • https://cdn-cms.f-static.net/uploads/4424953/normal_5fdc6be5aca18.pdf
    • https://womevelem.weebly.com/uploads/1/3/2/8/132814223/1828407.pdf
    • https://cdn-cms.f-static.net/uploads/4473388/normal_6033df2e1734e.pdf
    • https://cdn-cms.f-static.net/uploads/4497688/normal_605465898f839.pdf
    • https://cdn-cms.f-static.net/uploads/4445324/normal_604f8b5bc6220.pdf
    • https://static.s123-cdn-static.com/uploads/4425235/normal_5fcf3c0835fa7.pdf
    • https://cdn-cms.f-static.net/uploads/4470543/normal_6039fdc9e23e2.pdf
    • https://dasewukux.weebly.com/uploads/1/3/5/9/135956745/397de69.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fd5035e9-4bce-4517-b78e-879c79c57bf5/fujotuzo.pdf
    • https://uploads.strikinglycdn.com/files/2f82d128-83d1-4f11-b332-f26e5c608e13/nc_drivers_manual_practice_test.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_off0000ef51.bin
36e587ea53e84aa75dc82d764d1b37e61ce6707983545fc76573b5ff3d332b5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 5076 bytes
font_01_sfnt_off0001008e.bin
948420a386746edac7ea557d2e23012559df35bbb96b4fe1f21bd6ab6d566ad4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1008E 10740 bytes

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