Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f645f2fb650c74…

MALICIOUS

PDF

82.0 KB Created: 2020-11-23 04:30:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36f90b95880d411d1772e53a81eeed2d SHA-1: 976aea6e702b48655c07319879ca994776978f68 SHA-256: 86f645f2fb650c741b7599fe01e31fbad19cce9066092ef2cc6644cae38aede3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The primary URL, 'https://traffking.ru/123?utm_term=beauty+and+the+beast+libretto+vocal+book+pdf', is presented as a lure to download further 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://traffking.ru/123?utm_term=beauty+and+the+beast+libretto+vocal+book+pdf
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/dcab2e3fd7.pdf
    • https://nakofasojerurog.weebly.com/uploads/1/3/4/5/134592478/4969082.pdf
    • https://cdn-cms.f-static.net/uploads/4370543/normal_5fb4b4a080469.pdf
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5f93fe45b42d4.pdf
    • https://cdn-cms.f-static.net/uploads/4482230/normal_5fad8ff02afa6.pdf
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5f8c0fb843ff6.pdf
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f909dd8eab04.pdf
    • https://cdn-cms.f-static.net/uploads/4450250/normal_5fa1ad086784a.pdf
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5f9d81c407d1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b5ef92f9-018c-40b7-a554-7217fe9c8384/964620203.pdf
    • https://uploads.strikinglycdn.com/files/dd481396-c608-4dfd-8598-f4f7bebbfda4/87074763498.pdf
    • https://uploads.strikinglycdn.com/files/b6e7f208-7c03-4a57-9014-f58c07b8c26d/dgf_middle_high_school_rota_spain.pdf
    • https://uploads.strikinglycdn.com/files/668f4df3-4ca4-4ff3-8d67-2c746d89e133/nuevas_vistas_curso_avanzado_1_cuade.pdf
    • https://uploads.strikinglycdn.com/files/21cf9c9c-9e34-4b00-a6a4-f336ca842560/laxelilik.pdf
    • https://uploads.strikinglycdn.com/files/1e9840ea-e512-481f-ac2f-a53ee5a39a8e/togavuxomafuxejot.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_off0001007f.bin
c6e556d2721a549d2651541afb4b7760b4f2ee8fbfb35f47017ae7b824c71965		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007F 5656 bytes
font_01_sfnt_off000113bc.bin
4fc8acb07edad39a051f0ab6730c411d4afd53c9eed6f583185b3c8e3f70f8ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113BC 11464 bytes

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