Malicious PDF — malware analysis report

Static analysis result for SHA-256 97287a76a834e83a…

MALICIOUS

PDF

67.1 KB Created: 2020-11-17 14:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4ff020ec2870dac254df7ea5eb7d84ed SHA-1: 1ef16fcf43c0e160ce0261ed997306b37f4c8fcd SHA-256: 97287a76a834e83ad5763124b572ebe9b9bb21279442cdf547e722316d38854f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or are part of a link farm designed to artificially boost search engine rankings. One critical heuristic indicates a link to known malicious redirector infrastructure, specifically 'traffmen.ru', which is used to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffmen.ru/aws?utm_term=autocad+2010+product+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f8babe8c3a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_5fa5115e3956e.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/1507993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421360/normal_5faf072c80952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5fab6fe95561c.pdfIn PDF document text
    • https://tozijaletaxe.weebly.com/uploads/1/3/4/3/134312516/podonufiruvawu.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/a0bc8389f.pdfIn PDF document text
    • https://zoseruvabu.weebly.com/uploads/1/3/4/4/134492528/vematisagevidal-sorofopunojake-vaxifore-xilafem.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/memul/jiwebugepezamapasel.pdfIn PDF document text
    • https://s3.amazonaws.com/jaburirarov/andy_warhol_self-portrait_1986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0aa2d66-d63e-4948-8018-ec5aaf66e409/43993997885.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/91626937248.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/generation_kill.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_off0000c95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95C 5340 bytes
SHA-256: fec6919aac0f3d938d21de1c671e15233880d06e7e71cd58c80470039000d46d
font_01_sfnt_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 10520 bytes
SHA-256: 997d1106fa918323e7270e981b1570ca35e72afdbd8845f23c6a3c86c72085b1

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