Malicious PDF — malware analysis report

Static analysis result for SHA-256 246cb69c52b66a3a…

MALICIOUS

PDF

67.6 KB Created: 2020-11-28 10:39:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: ddf2c50141694d6702b1357a558dc40e SHA-1: 175bcd2dc8551dafa8f421266c844ab519b62bdc SHA-256: 246cb69c52b66a3ad070d53c43a4dd7f0ba48309eca8cbf9af2759c7d0b382c2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classified as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffe.ru/strik?utm_term=asis+professional+investigator+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414175/normal_5fbae41b57a5c.pdfIn PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/giretotusaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f8e47b0602b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418796/normal_5f95a89dda7e0.pdfIn PDF document text
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/fojajikidadesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_5f993dd7aec6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_5fb61d0148c03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482623/normal_5fbd61b300577.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7d4ffaf9-1145-4b57-b256-689470368a9d/2071334103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2e66d2-0712-4d67-9a6d-81f08fb7bc89/bin_s_xe_51g__qun_my.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/norekigamagejeruv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f0ab26-64e6-4634-9d15-d25548289881/42999039096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b4f6658-84e1-4ae0-91f0-47463a4a418f/30949937441.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/nicole_and_keith_kids.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 5152 bytes
SHA-256: d462ea8f542a269021748c4c26d88330747354eef82fdfe14893e13f371036d8
font_01_sfnt_off0000c493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC493 14784 bytes
SHA-256: 0a35eb4dbef94e532ec3258a43deee32ba2bf81b76253cabd46e6914bedd3ba2
font_02_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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