Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1deefd4bf1a80f3…

MALICIOUS

PDF

68.6 KB Created: 2020-11-19 07:02:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 71fd92c9aea2fde485dd9e32d077879f SHA-1: 994e8f8b8377786933eef7e7ea7e8361c39de1ee SHA-256: a1deefd4bf1a80f3cd4ccb8c0fa733151f2f3f803cebcf684dcd9e678791cfb2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm and a high ML score, indicating malicious intent. The document contains numerous external URIs, with one pointing to 'trafffe.ru', suggesting a phishing or traffic-generation scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of many external links strongly suggest it's designed to redirect users to potentially malicious sites, aligning with phishing and SEO link farm tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=intex+pool+ladder+36+inch PDF link annotation
    • https://kitarenabokuvum.weebly.com/uploads/1/3/4/4/134479912/fobogegojipulazer.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/nagifesataguze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_5faa3e44c1584.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/voxazedisula/korojufuzodot.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/wofitimekilawiliravel.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/los_fisiocratas_economia.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/28622300430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bb94f75-3c16-42e5-98c3-6b5294304dd7/74374285071.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/kusotamuforetig.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/i_had_a_dream_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/bopunajelewabuzuf.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_off0000d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18C 5308 bytes
SHA-256: b10b9947a3b5c0d1b83e8f8bfdfcd32aa571498a660c82133c3fdee9e2a25a22
font_01_sfnt_off0000e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE391 10088 bytes
SHA-256: dfbbc5a09abc53cb5f8c7ca3a0131e72edda2d7a82d93defbbd4cec4c0ed8010

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