Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b9022b928a1cd2…

MALICIOUS

PDF

82.2 KB Created: 2021-04-22 17:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d09c167df9c78b10eb445194a9d9b20 SHA-1: 3452a945b0dd70fa9a44813c63fa28023ad10642 SHA-256: 29b9022b928a1cd22ed41b7fb4535f01b47bd49053a12472cb54ca30eb168f0c
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. This, combined with ML and ClamAV detections, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=denon+avr-x4000+price
    • https://static.s123-cdn-static.com/uploads/4484605/normal_5ffce30762ab5.pdf
    • https://static.s123-cdn-static.com/uploads/4484804/normal_5fc79f222efbf.pdf
    • https://cdn-cms.f-static.net/uploads/4414176/normal_603f3d2886c3a.pdf
    • https://cdn-cms.f-static.net/uploads/4417653/normal_6068ed39a7004.pdf
    • https://static.s123-cdn-static.com/uploads/4477913/normal_60044c5026e0a.pdf
    • https://cdn-cms.f-static.net/uploads/4373797/normal_606c7664668a2.pdf
    • https://cdn-cms.f-static.net/uploads/4411501/normal_5fe6902685846.pdf
    • https://cdn-cms.f-static.net/uploads/4473632/normal_601e019cadf95.pdf
    • https://cdn-cms.f-static.net/uploads/4491410/normal_603972404e11b.pdf
    • https://static.s123-cdn-static.com/uploads/4470542/normal_6009a2896d7ea.pdf
    • https://static.s123-cdn-static.com/uploads/4470029/normal_5ff4a1654236c.pdf
    • https://static.s123-cdn-static.com/uploads/4426073/normal_5fe5eb82f3fd0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/38eccce7-8656-4959-9344-525770528cab/34817420759.pdf
    • https://uploads.strikinglycdn.com/files/ff4eb60d-ec81-40d2-a880-f52881210912/texas_cdl_practice_test_general_knowledge.pdf
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_d72b470097684756a5335181b67df5dc.pdf?index=true
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_2aebd491fd68412aa8037264ca0558a0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9663c6a5-8b8b-4246-9bae-79f332e231fa/bissell_spotclean_proheat_pet_attachments.pdf
    • https://ebed6276-6372-4ddf-adad-9a0fa504b99f.filesusr.com/ugd/805d2a_20f45752fe514f7787bdf90e4a9e083e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b8995a13-4dfb-4719-b507-d12ea4c15c01/interior_design_apps_free_singapore.pdf
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_0f9322412add461b94a9cd14068e3ae1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/44b061a0-cfb0-4a93-a5a8-028fe6a02b4e/18254396542.pdf
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_6d86522ba2fc47588211d0148a42c995.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_off0000f74d.bin
4f020316567f429d8d1b4a8650cfc12df8f646cad917c8e0cbb17e0e2950f50f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 5104 bytes
font_01_sfnt_off000108d9.bin
7dbe4c3ceb39a8d2c9df25d1fd4bc9d81a85c7c0110976b08fa521133d786b06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 22272 bytes

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