Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdfba2b5e1f9423…

MALICIOUS

PDF

83.4 KB Created: 2021-01-11 20:07:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1226203185bfe073d2e6974a9913b7f8 SHA-1: f13dc5e74efecf9a3d58736a1c07b3932a4d3f26 SHA-256: 7cdfba2b5e1f94236ae56367751208d074f616ca568d27667e27563e4f067b62
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URLs, with the primary one being traffset.ru, suggesting an attempt to redirect users to potentially malicious or SEO-abused content. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a malicious intent to drive traffic to external sites.

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
  • 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://traffset.ru/123?utm_term=el+delantal+blanco+pdf PDF link annotation
    • https://bipejazikapidim.weebly.com/uploads/1/3/4/5/134529651/gagef.pdfIn PDF document text
    • https://site-1172896.mozfiles.com/files/1172896/music_inception_piano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_5fd7dc6aedd9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382613/normal_5fc7b58fa872b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417999/normal_5fa1e93d3160b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367964/normal_5fc0e75ec8394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486350/normal_5ff04cc5b9bad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_5faf865d03a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422876/normal_5fbcaa860c0bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468836/normal_5fdf92b1c66cb.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/2753659.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 4972 bytes
SHA-256: 9c14bc44b5c612d7c34ceb7a8a2b916893c2bed4e04f25c5a00eb2bd562acc5d
font_01_sfnt_off00011a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 11508 bytes
SHA-256: 1af14f1059c190768c4f5c60d47d1be3973cd9e520319ff7c8d7a14895cd08fa

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