Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c7fd2ea5fd639a…

MALICIOUS

PDF

71.5 KB Created: 2021-02-19 10:15:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: befbbd13b95f0b74df8629bbe8974950 SHA-1: 7a13b352f9bfedbe8e9ab0fbf4a7c895d18f7484 SHA-256: 79c7fd2ea5fd639a8e27893d46253fc23e6cf355867a1640ecad20fadfc0385b
156 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 pointing to other PDF files, suggesting a link farm designed to manipulate search engine rankings or distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious campaign.

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://bologen.ru/123?utm_term=tower+t16004+electric+pressure+cooker+manual
    • http://winoorama.site/xemiwiresema5xsnz.pdf
    • http://svoytrylend.xyz/kojizawa9722g.pdf
    • https://cdn.sqhk.co/zuvifilezaja/gcKighe/pamegesurejoselebikino.pdf
    • https://cdn.sqhk.co/takularozo/yqRjejg/wejeroxazujebixexufalizu.pdf
    • https://wosodaguv.weebly.com/uploads/1/3/4/5/134590300/xirekeloxalap.pdf
    • https://cdn.sqhk.co/xawodoze/3KhhIhh/87611565951.pdf
    • https://cdn.sqhk.co/wodelaganav/gd9jfhf/subway_princess_runner_game_install.pdf
    • https://fasexunatosupa.weebly.com/uploads/1/3/1/6/131606354/4986580.pdf
    • https://xiluxobafuju.weebly.com/uploads/1/3/5/3/135323992/4277179.pdf
    • http://goodshopsales.xyz/future_going_to_vs_will_exercisestrwqf.pdf
    • http://cmbmarketing.agency/rarigezukimugepagunzjutu.pdf
    • https://nopuxexej.weebly.com/uploads/1/3/4/4/134498230/465b9d8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gisujubolidine/nasidusabepavipakupe.pdf
    • https://s3.amazonaws.com/jixeremipet/77755290421.pdf
    • https://s3.amazonaws.com/vonusirukete/jamamub.pdf
    • https://s3.amazonaws.com/zafaronivaj/88104816670.pdf
    • https://s3.amazonaws.com/nuruvapozixix/gonipasugegonubefume.pdf
    • https://s3.amazonaws.com/ruzaganog/busqueda_por_imagen_android.pdf
    • https://s3.amazonaws.com/gonima/faxuwuwazasag.pdf
    • https://s3.amazonaws.com/xazarujokemus/94696865529.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_off0000d8d0.bin
69d3a3ecbdfae4c55204b5646d5f8732136ce4ea0f80920cc3fa96d0847a3f38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D0 5620 bytes
font_01_sfnt_off0000ebf0.bin
b7239cd0eb1179997150b16c31b2300066d0c7c7005b109db3d636e6e8d002a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 10744 bytes

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