Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf16a64e2e910098…

MALICIOUS

PDF

73.2 KB Created: 2021-06-05 19:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3935cd6c532efe00d6617a02fb4cef2 SHA-1: 405b7eb62ab5317c95139c401d8ed78ce40f2b19 SHA-256: cf16a64e2e910098a9356dd7dc2942bf6dbdda9b244093ab8846a39414017215
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or redirecting users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content.

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-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://dugedepap.ru/123?utm_term=mediation+vs+arbitration+pdf
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/7993175.pdf
    • https://static.s123-cdn-static.com/uploads/4379610/normal_6005c154c2603.pdf
    • https://nawajutexi.weebly.com/uploads/1/3/4/1/134108687/6f459407d8a3206.pdf
    • https://dibodowe.weebly.com/uploads/1/3/4/6/134686502/2154671.pdf
    • https://static.s123-cdn-static-d.com/uploads/4501770/normal_60b3e5451e0b0.pdf
    • https://rajivuwos.weebly.com/uploads/1/3/4/3/134398668/tosad.pdf
    • https://static.s123-cdn-static.com/uploads/4366041/normal_6006fa44783cd.pdf
    • https://pikimekexer.weebly.com/uploads/1/3/4/5/134587048/eb8dc18120ba41.pdf
    • https://static.s123-cdn-static.com/uploads/4368951/normal_6000218199876.pdf
    • https://falogumirej.weebly.com/uploads/1/3/4/3/134368081/baraju_ditegefutilo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/861aef6c-5bf4-4c80-8155-0b8f399469ff/can_undocumented_immigrants_get_drivers_license_in_new_york.pdf
    • https://uploads.strikinglycdn.com/files/d4eabf40-cf2b-46af-a3da-c7a957368dfb/6624547933.pdf
    • https://uploads.strikinglycdn.com/files/ba657561-b628-4639-bc3e-de34b5dd43a1/vafix.pdf
    • https://uploads.strikinglycdn.com/files/f62330ed-eebd-42db-99e5-96f79c2626c0/donijo.pdf
    • https://uploads.strikinglycdn.com/files/97b761d5-d151-4901-92d4-5cdf76739e55/vans_old_skool_black_and_white_mens_size_10.pdf
    • https://uploads.strikinglycdn.com/files/481b8a02-9075-49a8-af09-5b7f06bed5c8/24149589914.pdf
    • https://uploads.strikinglycdn.com/files/f1d7aa74-3af4-40da-93ab-bd0bcee832f5/linux_shell_commands_cheat_sheet.pdf
    • 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_off0000e2ef.bin
75bc57f2e84176952053d0b2629aa1db24e204ff7936444462629f6a7d91b583		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 5208 bytes
font_01_sfnt_off0000f4c1.bin
a25a171e47731ddabcf1a63bba519435f3ef6b36c96bf51d95fbd1750dddb946		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 10172 bytes

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