Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ced26dc56c6439f…

MALICIOUS

PDF

74.1 KB Created: 2020-12-28 20:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb3fd3d4b5fb8e9e10048aa71035dade SHA-1: de017f23b936181574427b47e8d2c3b7c45021cc SHA-256: 5ced26dc56c6439f539bf687f15c54f16aa1f785dd387c80f6d72a8cab85f8d5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO spam campaign. It contains a large number of embedded external links, with a primary suspicious URL pointing to 'trafftec.ru'. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to potentially harmful websites.

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://trafftec.ru/strik?utm_term=watch+nfl+games+online+free+uk
    • https://static.s123-cdn-static.com/uploads/4464996/normal_5fca086497aa3.pdf
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5f90d8c15a8fe.pdf
    • https://xazapadikud.weebly.com/uploads/1/3/1/8/131871762/3837462.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2b5226ba-fb2e-4e44-b620-94251482754d/nifumonirulixurov.pdf
    • https://s3.amazonaws.com/neviwove/80093007079.pdf
    • https://uploads.strikinglycdn.com/files/75097c55-f8a8-4741-ba11-9b562275d4d5/37639072567.pdf
    • https://uploads.strikinglycdn.com/files/9374859c-da5b-4330-9e76-8ec2bcefd857/wosesoriforiwuxidupuniv.pdf
    • https://s3.amazonaws.com/xozeb/givetepabudafapudononiz.pdf
    • https://uploads.strikinglycdn.com/files/9b7c186d-5673-4e98-af66-c36f0f511e2d/girl_scout_brownie_songs.pdf
    • https://uploads.strikinglycdn.com/files/994aa263-37ec-4787-87cc-27e26256f4a7/43448974739.pdf
    • https://uploads.strikinglycdn.com/files/f20adaf8-8c0b-4751-bfc8-ab88a4d44e08/32975457345.pdf
    • https://uploads.strikinglycdn.com/files/3657d7ce-5c72-4e20-b1c9-287a461f07e9/54419200828.pdf
    • https://uploads.strikinglycdn.com/files/5920df0f-c749-4898-8fc3-90d01ffd99a1/fun_math_brain_teasers.pdf
    • https://uploads.strikinglycdn.com/files/f4073c93-3d30-4352-a0f0-0e7221522ee2/cafe_zupas_online_order.pdf
    • https://uploads.strikinglycdn.com/files/4895b480-5098-4d0c-9ab0-d5926c7e78e6/what_did_the_payne_aldrich_tariff_act_do.pdf
    • https://uploads.strikinglycdn.com/files/2787f0f1-693a-435d-ae72-df7532dd9c4f/tipo_de_oraciones_compuestas.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_off0000e67b.bin
c49eebc496c68f143af885a573116f875a278de51e21738d6262379c3df7b62d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 5372 bytes
font_01_sfnt_off0000f8a7.bin
d4e16be7ce370cbafbf2df5f654482319fa380e831dcbd838182af162655d997		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A7 10212 bytes

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