Malicious PDF — malware analysis report

Static analysis result for SHA-256 1663f875502df009…

MALICIOUS

PDF

66.7 KB Created: 2020-12-10 02:49:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c989ee8ebb72d0c012902ef9244db11 SHA-1: 1d4dcb7572dbae27181b4c7f19e2bfc6cfd734ef SHA-256: 1663f875502df0095aa94c8e2269ab3171735c41391bf35be701ef330c0ed04c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to 'traffine.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to 'car form' and 'wkhtmltopdf', hinting at a lure to disguise the malicious nature of the file. No scripts were extracted, but the presence of multiple external links and the high detection scores strongly suggest a malicious campaign.

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://traffine.ru/strik?utm_term=car+form+lr+revised+12%252F19
    • https://jimamejovegevag.weebly.com/uploads/1/3/4/5/134593921/jojutudovegurilo.pdf
    • https://jumemovelavubar.weebly.com/uploads/1/3/4/5/134516611/3749591.pdf
    • https://lorujuxivole.weebly.com/uploads/1/3/4/5/134595667/repajikiwatovog-lasikabesukejad-memede-xafirezurozo.pdf
    • https://cdn-cms.f-static.net/uploads/4385204/normal_5fc37dd6c0d25.pdf
    • https://gisetokitalakak.weebly.com/uploads/1/3/4/6/134600310/roxamorogim.pdf
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/bedijenutowulixa.pdf
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/ruzarip-ruritubanex-direxapar.pdf
    • https://cdn-cms.f-static.net/uploads/4449779/normal_5fbaabb53ebad.pdf
    • https://cdn-cms.f-static.net/uploads/4371004/normal_5f8cb1f737a99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kakekojezutok/codigo_secreto_de_newbies_on_fire_tv.pdf
    • https://s3.amazonaws.com/forupokisip/94267357461.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/88017762586.pdf
    • https://s3.amazonaws.com/tibitexil/62366391885.pdf
    • https://s3.amazonaws.com/najubu/platform_marathi_movie_video_song.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_off0000c8d3.bin
89eb35eebe99b2ad3ac21c304e1190fc204f7a41599fbb97f4318ccd35df05c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D3 5392 bytes
font_01_sfnt_off0000db22.bin
a9f98d37ac3de4e1bd9ac1ca2b714f31a98f7f7fa7db989956d9c7c49acf0e1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 10404 bytes

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