Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f90bfae2a67edb…

MALICIOUS

PDF

68.5 KB Created: 2020-12-25 14:16:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 715f85e513ffd8f60db3a067abc02d32 SHA-1: 6bf611f94b9526f8044a0ac3b4cd7ff5080afc53 SHA-256: d1f90bfae2a67edb498b6a3d45a79279b999f82fee6039a8ff578772bae98791
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various domains, indicative of a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=torn+acl+in+dogs+brace
    • https://cdn.sqhk.co/sejujona/jU8XFie/javakobijesujowimasu.pdf
    • https://cdn.sqhk.co/jumifokujuje/igPPidQ/word_jumble_champion_south_america.pdf
    • https://cdn.sqhk.co/palubavuz/jajgwdT/jufavazoriwaxufezowonif.pdf
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/e0e7c2ec6ce.pdf
    • https://cdn.sqhk.co/bitubebo/RFN18M3/mexanojugok.pdf
    • https://zukinubugepar.weebly.com/uploads/1/3/4/5/134514864/zofobutijeje_sudunila.pdf
    • https://cdn.sqhk.co/kuxefoxo/jcyzgcU/gravity_bounce_shoes.pdf
    • https://cdn-cms.f-static.net/uploads/4480383/normal_5fac0fa92e23e.pdf
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5fb29e7073d3e.pdf
    • https://cdn.sqhk.co/lotazoza/ifthdhe/bavim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/guvovigo/malusubesad.pdf
    • https://s3.amazonaws.com/mukutud/esperanza_rising_online.pdf
    • https://s3.amazonaws.com/damevusom/wasoputekoveniba.pdf
    • https://s3.amazonaws.com/ruzaganog/87398850156.pdf
    • https://s3.amazonaws.com/sepawi/33417287298.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_off0000cf93.bin
553acc7e53761434d57ce9831999743f0f2363f5eab72a806a272d422973fa27
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 5196 bytes
font_01_sfnt_off0000e146.bin
882492de229b439733335b3ba3bb53b9fbb6dde3541c49baa14ddf4b6904d094
pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 10568 bytes