Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bcfdd4629dec38…

MALICIOUS

PDF

65.5 KB Created: 2020-11-28 00:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ab8d0f53cf62a7e2cfbce03b43981daa SHA-1: 73c3a805a8dbbf5775a7385ae8fe2a73f09ff9bc SHA-256: 13bcfdd4629dec38bd1b27823cfe753263fdceef5c29a7976cfb9b8c008452ea
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one to 'trafffi.ru' which is labeled as unknown reputation, and another to 's3.amazonaws.com' which is part of a detected link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious content.

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://trafffi.ru/aws?utm_term=combine+excel+worksheets+into+one+sheet PDF link annotation
    • https://lukafitujukeme.weebly.com/uploads/1/3/3/9/133997152/6425354.pdfIn PDF document text
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/5882351.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/3950785.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/citra_android_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/78263738076.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/go_transcript_test_answers_march_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/21876554528.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/gross_anatomy_of_the_brain_and_cranial_nerves.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/66892403760.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/82748842806.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/tapijojizerenikinur.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/importance_of_investigative_and_interpretative_reporting.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/watch_ufc_online_free_live.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/angular_material_svg_icons.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_off0000c54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54C 5096 bytes
SHA-256: 1ff86a9cc80c9133fa4a1dee16ea16789ed0cd7b4b8e262e962b1b5c77171f8a
font_01_sfnt_off0000d68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 10080 bytes
SHA-256: 7d1f72c7034e8b136871b272e9186256440d83ae18ff98f8093b185ad8a3a099

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