Malicious PDF — malware analysis report

Static analysis result for SHA-256 2616a2400c612f44…

MALICIOUS

PDF

72.1 KB Created: 2020-11-26 01:20:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 847969611a38db93998d846914f42a8e SHA-1: 14c7173a8806da63eaf5f4a854796f66fba3edec SHA-256: 2616a2400c612f447d2c6e4dc04a080f9e4464f50f041bcd991a17beef902141
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO spam campaign. The primary external URL observed is https://traffine.ru/strik?utm_term=ffxiv+thaumaturge+guide, which is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/strik?utm_term=ffxiv+thaumaturge+guide
    • https://cdn-cms.f-static.net/uploads/4460447/normal_5fa4035164e90.pdf
    • https://cdn-cms.f-static.net/uploads/4411490/normal_5fa62672b7a36.pdf
    • https://cdn-cms.f-static.net/uploads/4408712/normal_5f938be31c375.pdf
    • https://cdn-cms.f-static.net/uploads/4443325/normal_5fbafbf96951d.pdf
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/6404364.pdf
    • https://sutafufig.weebly.com/uploads/1/3/4/4/134402916/c82a470.pdf
    • https://cdn-cms.f-static.net/uploads/4381748/normal_5f8dd4449e9d9.pdf
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/016b6a36d142c.pdf
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5fbbf04f6f0ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/02467d77-6e67-4e89-b6cc-0920de31c3ce/vunarumiladisozuvolod.pdf
    • https://s3.amazonaws.com/subud/79342657171.pdf
    • https://uploads.strikinglycdn.com/files/3fa0da8a-b4cb-4317-b326-2ed27a16ea28/plane_and_solid_figures_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d245.bin
6ac4c03a14c9f7408e7d9870f91210ea2a0957b2e85d5757f1ed9ead6daf510a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD245 4860 bytes
font_01_sfnt_off0000e2d1.bin
4a7f27e7d364e1dd6757608dfea28373f231939846a696d3d4ecfe87eda26d4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10092 bytes
font_02_sfnt_off00010565.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x10565 4324 bytes