Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bee804abf4eb12a…

MALICIOUS

PDF

75.8 KB Created: 2021-03-05 19:23:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f46a0f5e38fa6fc9f3f0b91b7a5ba73 SHA-1: 7894a3e4b027e93ede2ef342d995a8a0428da000 SHA-256: 8bee804abf4eb12a148582cc7f7c1d273c68f2cd7da95957d6b67e98926e0dcf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in phishing or SEO spam campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious sites.

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://vilenefex.ru/wix?keyword=tolland+middle+school+staff
    • https://cdn.sqhk.co/novozefox/iahahfH/morimikunud.pdf
    • https://cdn-cms.f-static.net/uploads/4366003/normal_600c0c38d352d.pdf
    • http://tiktokcopyrighthelpteam.com/46965813241amuu5.pdf
    • http://linza.media/surah_abasa_fullt73u2.pdf
    • https://cdn-cms.f-static.net/uploads/4426816/normal_6019352f015a4.pdf
    • https://cdn-cms.f-static.net/uploads/4387036/normal_6040127a24850.pdf
    • https://cdn-cms.f-static.net/uploads/4384035/normal_60167bba1acfc.pdf
    • https://cdn.sqhk.co/sojowidaz/i7heUia/the_room_store_furniture_in_richmond_va.pdf
    • https://cdn.sqhk.co/kekelivig/paiagcl/41086173398.pdf
    • https://cdn.sqhk.co/lepavenujal/vQ21hf7/51915952618.pdf
    • https://static.s123-cdn-static.com/uploads/4451221/normal_5fcd8d403d4bc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_f40c6405cadc4d72985eb3c937d38cf7.pdf?index=true
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_6fca2324e0e049e8ac70df9f4aadbc6c.pdf?index=true
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_14bcfde8c64d4241961f124a0e9aa128.pdf?index=true
    • https://667b589a-70dd-4c78-a03f-47f6e9f07b1f.filesusr.com/ugd/db80c5_1d52bfd5c7c54ae683f62fc56171376f.pdf?index=true
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_e74dbd2b76f340edbd161fc23a5577d4.pdf?index=true
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_30193d15a654429b86fe8be2a23aa80d.pdf?index=true
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_e4eb6589b9de46dbb75f0f3c6f78c0bb.pdf?index=true
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_b4903b70c0a842c2b573bd7058b26d65.pdf?index=true
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_c6d2587854b946b2a9638dd00cbaa85a.pdf?index=true
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_0b89b756708a47f0973668fbe414462e.pdf?index=true
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_a5d2ea13f16b4d059bf7dbdc5641e9e9.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_off0000ecf0.bin
40cb553c662a39c310283fe541336659d21c2dda37983ebf23693343dc6cd635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 5116 bytes
font_01_sfnt_off0000fe33.bin
c76facf6aa4050b6c0d7d7982ac043ce7a9820f007f2eeb80bef91087f644d52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE33 10488 bytes

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