Malicious PDF — malware analysis report

Static analysis result for SHA-256 813c136c1a1f3ccd…

MALICIOUS

PDF

72.7 KB Created: 2020-12-27 21:26:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e2710226149625836ee708088a905a8e SHA-1: 5f5817efa5cdd8f1cbe01c095e52889b1c9c8821 SHA-256: 813c136c1a1f3ccdbd606e5e459e2b75ef708ae4cc22a612b9c06b55bf0be73c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a site that appears to be part of a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=best+photo+editor+website+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464709/normal_5fbc10a6b571d.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/2804728.pdfIn PDF document text
    • https://kubazavazagemu.weebly.com/uploads/1/3/4/4/134464578/nunovib-tubekewivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/156f04ea-c387-44c2-b296-86a4012ed286/11787227034.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/graco_nautilus_65_3_in_1_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3f5cb8e-4373-4bef-8619-26b72e91f0e2/sugaxut.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/ripekibokilik.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/piluna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b4b137-a99f-4619-9c40-e2a0a9d4434d/47148700863.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/cacti_for_windows._exe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a40cd8-ad01-4ca7-bfd8-c8fd18f7a842/gidugamafopupewukom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7592b3e8-c17c-442d-a1b3-0ffb1929501e/wejivarewuwuxugimumotapa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 5168 bytes
SHA-256: cd9b47a3dc337c1e3d9ed0b1a69809487e4a4e83095f146f16176479ca587783
font_01_sfnt_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 11008 bytes
SHA-256: c71296be079ebe73a97b63a482dd8cb0142f48e0148643a45fed18d092bc1442

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