Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d026b6a41be986e…

MALICIOUS

PDF

74.5 KB Created: 2021-03-20 21:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6223801b9bc5965230ec2152ac9dc91f SHA-1: 5022b439921aec6f679378e93b0d09a0a1de112d SHA-256: 2d026b6a41be986eae0dac35b90750310d88753b1bd038cdfc5e7ba6fcb88e9d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files, suggesting a link farm or content stuffing tactic. The primary malicious URL identified is golowaki.ru, which is likely used to host phishing content or distribute further malware. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=how.much+is+an+oil+change+at+take+5
    • https://static.s123-cdn-static.com/uploads/4464313/normal_60017451eb8f5.pdf
    • https://static.s123-cdn-static.com/uploads/4409806/normal_5feb0bfe9343b.pdf
    • https://cdn-cms.f-static.net/uploads/4375357/normal_6052de86003c8.pdf
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fc7c457e43c2.pdf
    • https://cdn-cms.f-static.net/uploads/4416930/normal_60305bc6bb049.pdf
    • https://cdn.sqhk.co/letarezetap/qCFbfIF/free_funeral_program_brochure_psd_template.pdf
    • https://static.s123-cdn-static.com/uploads/4459180/normal_60089df8ec800.pdf
    • https://cdn-cms.f-static.net/uploads/4384832/normal_604b946ed0184.pdf
    • https://cdn.sqhk.co/navififoro/gfX9ege/sniper_killer_assassin_shooter_pc_game_download.pdf
    • https://cdn.sqhk.co/tubafejog/xPvihjf/sekoriwiru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0475d37c-0ed1-4df2-838c-666dd9aefe59/2002_ford_explorer_v8_transmission_problems.pdf
    • http://ninalosuza.rf.gd/fejakigurunekis.pdf
    • https://b3709dad-42f4-4621-9b7e-74d31ca978cd.filesusr.com/ugd/f91cf1_90ea942775b1491b94dde95eaaa54358.pdf?index=true
    • http://telawusufolij.epizy.com/furuwipefejugukujexatox.pdf
    • https://uploads.strikinglycdn.com/files/a983dd6e-71b1-428d-9875-eef521197752/how_big_is_whirlpool_duet_washer.pdf
    • https://uploads.strikinglycdn.com/files/25150c2a-4d9a-4355-840d-7413f7c10096/starbucks_coffee_cup_christmas_ornament.pdf
    • https://uploads.strikinglycdn.com/files/99c7b555-37c0-4e5c-b3da-087309d6d3a0/pizin.pdf
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_f5ce31ab4aae44aaa316868a3241311b.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_off0000e5d4.bin
3b0434876662ca1609e12a69d559c12f96091b7c86b6d0dd75025859600b4fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 5388 bytes
font_01_sfnt_off0000f824.bin
e8436ad8c059835b86e73a18e7207176d9e6a1e9c6107a2ef75c3423fb6d0d3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 10548 bytes

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