Malicious PDF — malware analysis report

Static analysis result for SHA-256 5408fd8d21a728a1…

MALICIOUS

PDF

81.5 KB Created: 2021-03-22 06:45:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cae8862287f715f600fd4a7a83a6adea SHA-1: e01c07e512f8ba164a5f916bcc670854dd8eb4c5 SHA-256: 5408fd8d21a728a11e4e81109e9e96c8b00ddcad30972a02d26f2d770a33c7e1
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/wix?keyword=mini+militia+hack+apk PDF link annotation
    • http://akillidestekbasvuruformu.online/josefopira7vjll.pdfIn PDF document text
    • http://detonic-italy.website/el_diario_de_greg_4_pelicula_completa_en_espaol_latino_descargarur02w.pdfIn PDF document text
    • http://pornbustyvids.com/how_much_is_a_used_xbox_one_controller_at_gamestopcas6i.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/j3iiaig/how_to_find_relevant_hashtags_on_linkedin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376610/normal_600eccc07152f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388432/normal_6031637398166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451027/normal_6015c9c4636c9.pdfIn PDF document text
    • https://cdn.sqhk.co/jenuluvonuz/fjacieZ/upfitter_switches_f250.pdfIn PDF document text
    • http://yewes.space/24313162967kf176.pdfIn PDF document text
    • https://cdn.sqhk.co/minutakumu/fheibjb/zusoxuzajifoxezuxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_d59cf0a506de4e4698b38eb950119450.pdf?index=trueIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_42d2ec89f8884778bccea4c1b92b43a8.pdf?index=trueIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_654b67daf11b4dec8fac6388a1bfc713.pdf?index=trueIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_5412e83c0ba94a2588e29ba40cc55903.pdf?index=trueIn PDF document text
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_f03998f72ab6465dabba59c79e146a56.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_c94e706c3c19462b9e204287154fc610.pdf?index=trueIn PDF document text
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_08d13d6c54a849d18c494e3f7891d2ad.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_82e7789e75f14c04bbe69f0ec5bfaad0.pdf?index=trueIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_902e652b6cbc4d92a13f705ef1b28151.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 4968 bytes
SHA-256: 3503449bc17dc427b4413dd1f294c4f6d169a65ccd3a803eaa926f192540b1bb
font_01_sfnt_off00011174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11174 11844 bytes
SHA-256: cfbd80d2bc754bb4a20ac31ff16d4bc7b929c57dae16f98f9d0ca1604072e677