Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58aaa6d9eeddb58…

MALICIOUS

PDF

132.9 KB Created: 2021-04-20 16:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d595ce66e2dc0d72f74b4d189e415f1d SHA-1: 9cf57a1491142f9b04566ee82ad12def98bcbbc8 SHA-256: a58aaa6d9eeddb58744349533637801c94816e948af0067faf6aae2655a57b59
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic flagging it as a link farm designed to direct users to malicious content. The primary malicious URL identified is zajinet.ru, which is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=republic+plato+pdf+hindi
    • https://static.s123-cdn-static.com/uploads/4451018/normal_5ff49bfd6eb06.pdf
    • https://cdn-cms.f-static.net/uploads/4383460/normal_602c6a711507e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_0be63aac586d4193a2937d35161ab2d7.pdf?index=true
    • https://s3.amazonaws.com/fopalew/47900254694.pdf
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_2db34c9bb7ec4e88873d709d4a42f231.pdf?index=true
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_33ee8e37e886439f8a96dc9e6d5d62ae.pdf?index=true
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_f21a203895c145f088cde741c3927a0c.pdf?index=true
    • https://95049c82-e412-4913-a0b0-e03e83d5170a.filesusr.com/ugd/127d6e_98d452c08f0f4990b559c94dce98a2bd.pdf?index=true
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_9e1abcde98cf4fc890cab00a2c199410.pdf?index=true
    • https://a0758896-f8c2-4fc9-8c7e-5c1738e8bc18.filesusr.com/ugd/0ce882_fd50cde706804ad9b0f78ac5a761d712.pdf?index=true
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_96299bcb27c944b284aaa39c49ed4d17.pdf?index=true
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_40b2d351c70343df9b5a2bb43f8a99ec.pdf?index=true
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_07b9dc83c24e4853bf29ad7e6bfb70a3.pdf?index=true
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_8e94b4b35690405588952127ef1758ec.pdf?index=true
    • https://s3.amazonaws.com/jifesu/vawulotunokaku.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_off0001c7ee.bin
2a5d37759c1dc3b841065a44401ffc93010c0dcb6b45a27e77d96c0e955b07a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7EE 5116 bytes
font_01_sfnt_off0001d957.bin
2d6722f77546d27ecf52d77336109ba9ec31ccfae4480ef7d99913ea0856d271		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D957 13812 bytes

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