Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c8a8379d617f6e…

MALICIOUS

PDF

68.5 KB Created: 2020-11-14 01:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bb0f6adf29a9a70a333c78eb041dea02 SHA-1: cfe2bb6dde231aadbf467f81bc833b8e119c301e SHA-256: b4c8a8379d617f6ed738ba6149b0e454f0ac35d46eb056566ad69ff47a519b6e
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, identified as a link farm, designed to redirect users to malicious websites. One such link points to 'traffking.ru', a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=nintendont+wii+iso In PDF document text
    • https://lakupemeza.weebly.com/uploads/1/3/4/2/134235705/c60dd3.pdfIn PDF document text
    • https://renesixedobalew.weebly.com/uploads/1/3/0/9/130969137/mekeza-rafejune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f907d38c5b9c.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/bapagok-sojomujaxifunix.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/eeb6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_5f87d6ff3f8ad.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/a3ba2e9e-495a-4504-878b-77e3916263f8/67600507905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62123f1-7d72-4484-8c27-3b36db679bc4/waniji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36d65c94-ec9b-4413-9076-79e6b8c6d9e4/nijunagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c1d0aa1-a620-4926-b0ab-cdac693f7b77/gataxatodegepatuxev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb705e58-9587-4ef7-bfa4-92f1a6e3c6a4/19040400061.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d48780ff-933d-4013-af17-29e7f671bee6/white_pages_cincinnati_oh.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/98602855164.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/seepage_flow.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_off0000ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 4540 bytes
SHA-256: 12588d8bdfa1f14d24592262d85f8f504dc27bd7597cb32184d26c9172ee0f77
font_01_sfnt_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 11488 bytes
SHA-256: 6df7deedf865342a4c1908cb5448c55662b4f327c977f27e9a01eb142cb67457

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