Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b7d8fb6357493b4…

MALICIOUS

PDF

66.3 KB Created: 2020-11-28 12:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5711a6e5b739effb0df9dbebdfbb013d SHA-1: e23ae1cad21cb0237cf1a2192f2678a109f6d8b2 SHA-256: 3b7d8fb6357493b4d6077e36eb428290196c598fe55a6bd51d0c486ca0b07007
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on disposable domains. One of the initial links directs to a known malicious redirector, indicating a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=ffvii+strategy+guide
    • https://resumaseba.weebly.com/uploads/1/3/4/3/134318739/6403796.pdf
    • https://tenaxujapem.weebly.com/uploads/1/3/4/3/134341928/bulogutijumikarel.pdf
    • https://wuwuleli.weebly.com/uploads/1/3/1/3/131398564/868192.pdf
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5fada2ebd0d86.pdf
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/6a31e54cd3a745.pdf
    • https://tojalalegeb.weebly.com/uploads/1/3/4/5/134584715/toxugug.pdf
    • https://pudibodug.weebly.com/uploads/1/3/4/4/134464821/730f26c81416.pdf
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/016b6a36d142c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fasanag/razoronorux.pdf
    • https://uploads.strikinglycdn.com/files/8f2d5c8e-7afa-400b-8497-8f01f38c6087/39031144606.pdf
    • https://s3.amazonaws.com/zesotat/xaxifupudoliwuma.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c773.bin
6251737fa294c3805d9c21c53097b2b1d8ea776d2e4cdac4b9c6ac0f55a33fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC773 5160 bytes
font_01_sfnt_off0000d929.bin
f9d08de7f5f631f44a240bc1fa7587126f9bb5276f824018ad59d4cc09afaa8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 10628 bytes

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