Malicious PDF — malware analysis report

Static analysis result for SHA-256 245f990f3b494e1f…

MALICIOUS

PDF

69.4 KB Created: 2021-03-16 00:41:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81d726c89cb8335e26c89719e93db040 SHA-1: 1b45574f1f0aaa7b5a78d000db4580cdcf6dfbd5 SHA-256: 245f990f3b494e1fc0569ac6421d480022bb158bf8bb4dd2db7c2e088e354404
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates it functions as a link farm, embedding a large number of external URIs, many hosted on disposable domains. The primary attack pattern involves directing users to these external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://lozipotod.ru/wix?keyword=radians+worksheet+tes
    • https://cdn.sqhk.co/vibefoparo/hazyjdu/red_ball_k_rm_z_top_sark_s.pdf
    • https://static.s123-cdn-static.com/uploads/4419832/normal_5ff38c8a4283d.pdf
    • https://static.s123-cdn-static.com/uploads/4425759/normal_5fee7da640cc5.pdf
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5fd32817ebf6a.pdf
    • https://cdn-cms.f-static.net/uploads/4366623/normal_602b6b7f89339.pdf
    • https://cdn.sqhk.co/lukedivibeb/UIxCl67/99990483806.pdf
    • https://static.s123-cdn-static.com/uploads/4366022/normal_5feb7e9291dfc.pdf
    • http://es50off.pro/29333189880wbh85.pdf
    • http://juzufezike.mygamesonline.org/dead_wake_summary_by_chapter.pdf
    • http://musc-media.xyz/lennox_ml180_owners_manual43eyr.pdf
    • http://nature-ital.space/biwowifeki7e7t1.pdf
    • https://cdn.sqhk.co/vujagefamig/liaAih0/fitizukebasoboxovez.pdf
    • https://cdn.sqhk.co/bajowekununa/iWhdgjv/balloon_dog_art_jeff_koons.pdf
    • https://static.s123-cdn-static.com/uploads/4445343/normal_6001121b0f43f.pdf
    • https://cdn-cms.f-static.net/uploads/4392472/normal_6020464bc45a4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_5c999550138e4fd0aaf72abe533b2de5.pdf?index=true
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_67ce0f723de44be98f1730c6b969903d.pdf?index=true
    • http://desejole.myartsonline.com/tonewoju.pdf
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_2083045a43994193b42860ce10b1be29.pdf?index=true
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_a6ee7b2e06614f3c8d41e1923b4faf22.pdf?index=true
    • http://manosotidokef.myartsonline.com/lozot.pdf
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_dfa5a570b54f4b0eafe58b59c68e9395.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_off0000d1c0.bin
866ceacfea3174273eba34fc3ae4b9cdb0fdf795c0234aa26d951f4ab8a28191		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 5044 bytes
font_01_sfnt_off0000e2f4.bin
b5da1d0295d6494974835efe1d710f5d8fe6a36b3022777a3639e2255f666e1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F4 11148 bytes

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