Malicious PDF — malware analysis report

Static analysis result for SHA-256 084361909f04642a…

MALICIOUS

PDF

75.8 KB Created: 2020-12-24 17:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b1977946a5b899664102f14167a24f9 SHA-1: 827b7460fd179c06d0431cbcfc37fcc70f4efc27 SHA-256: 084361909f04642a7412d3fe5ca8f590c568eec6e8440c00548114756ab98b51
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing or trojan. The presence of embedded URLs and the structure suggest an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafftec.ru/123?utm_term=watch+ranma+1%252F2+eng+sub
    • https://vufufibujirefe.weebly.com/uploads/1/3/4/3/134355905/9bde1d14452e165.pdf
    • https://zevijilutijeso.weebly.com/uploads/1/3/4/8/134850931/137674.pdf
    • https://kirugivedipabaw.weebly.com/uploads/1/3/4/4/134464293/5d7a3d6129c.pdf
    • https://fopabavegovos.weebly.com/uploads/1/3/4/7/134744375/vidikasa.pdf
    • https://cdn-cms.f-static.net/uploads/4457312/normal_5fda705c67b16.pdf
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/5012314.pdf
    • https://cdn-cms.f-static.net/uploads/4411714/normal_5f98679351bc0.pdf
    • https://cdn.sqhk.co/vawikepaf/gidGjgz/gukabu.pdf
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5f9d05516e209.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/welutizenop/lorido.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_off0000ec6b.bin
611266943316ce70a311ca2bd1f5858fad766891e0fb79290282fe59fb0391fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 5552 bytes
font_01_sfnt_off0000ff43.bin
b82853c050c3894a64ef4052d7016688e30ffaf37f36f5d1c9ee7d00dfd839d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 10384 bytes