Malicious PDF — malware analysis report

Static analysis result for SHA-256 239bc0498fd4b55c…

MALICIOUS

PDF

77.0 KB Created: 2020-12-25 14:43:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 452b47e65aa85b986e9d605fc5bcde13 SHA-1: b62d5eebf806b04f9cf11d7b81ffe9a135d69e5a SHA-256: 239bc0498fd4b55cafa84075d03c4103fa777adfe719cba4f99f69aabbb37c33
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to search terms, directing users to a suspicious domain. The presence of multiple external URIs and link farm characteristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffking.ru/strik?utm_term=duck+hunting+boats+for+sale+near+me
    • https://static.s123-cdn-static.com/uploads/4451206/normal_5fe421530c905.pdf
    • https://vokudaminovisuz.weebly.com/uploads/1/3/4/4/134495340/zakukatu.pdf
    • https://cdn-cms.f-static.net/uploads/4366347/normal_5f9aafa48318a.pdf
    • https://fabedajigunud.weebly.com/uploads/1/3/4/4/134480588/potijajiro-wewasojepox-rarij-sobilupidixo.pdf
    • https://xezolemi.weebly.com/uploads/1/3/5/3/135324657/budulitaros_rotasi.pdf
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/8b89f3f99a7.pdf
    • https://xiforamuti.weebly.com/uploads/1/3/4/6/134611992/fisoposag.pdf
    • https://mawubisevidezo.weebly.com/uploads/1/3/4/4/134480432/runodoguwatixiduz.pdf
    • https://vekeliludodim.weebly.com/uploads/1/3/4/7/134745250/491c6e5ecd304ea.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nefomojuwet/bajasot.pdf
    • https://s3.amazonaws.com/defujo/60013075697.pdf
    • https://s3.amazonaws.com/zopenave/gepotosoze.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_off0000f0e4.bin
ce9e05985613046cf2b5e7307210edb0b72d6a17c207cc9c87d52c740e704c4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 5496 bytes
font_01_sfnt_off0001037b.bin
ac22524e6a43ce14837ca771b7a10457f3632f7b283906bf9f286842a214a638
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 10740 bytes