Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4397b6071f65d96…

MALICIOUS

PDF

66.2 KB Created: 2021-01-09 07:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8e25b988ca44678c1a472c5d597db6d0 SHA-1: 9a150c48ce6d08035dc45cff41d71d417c565cdc SHA-256: f4397b6071f65d96d26c399b64d1abde5b20733a225918934fc4ecd0c1e6369c
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=ejection+port+cover+c+clip In PDF document text
    • https://kifewuwumezoduk.weebly.com/uploads/1/3/4/7/134740170/telodab-megibedesakuti-sopugafux.pdfIn PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/cc51d98562e213.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/5401885.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/cjb9Afw/94127131705.pdfIn PDF document text
    • https://vezejajanobel.weebly.com/uploads/1/3/1/6/131606482/9055372.pdfIn PDF document text
    • https://vedabigejiko.weebly.com/uploads/1/3/1/4/131438046/09b5f4560cfe19.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/bqPjcji/amazon_assistant_application.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/bce9070a-9725-4509-87f4-f7d6ba35507b/dowuxanav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf3367d-389a-4c5d-826f-6a57d9f0f7f8/still_hurting_piano_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ae7571-929f-441d-990e-a57f7c5c9708/totakugufeve.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_off0000c85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85A 4632 bytes
SHA-256: 067e6c4630abef83611b80ae6379e7d74f425786f3adec0c2e1bab2b75afdcfe
font_01_sfnt_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 10484 bytes
SHA-256: 928e64be7e522269b0444c5c84f2a76e2ffeec0d9f45721a071b84e5ca67b6b0

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