Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6896f8cd58b01e1…

MALICIOUS

PDF

95.4 KB Created: 2021-09-13 12:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbd7bf5d7e58f26ee8f43f156d75e239 SHA-1: 09a92b3f9fc9b18bdc757c19d2d9cd140a20bb2a SHA-256: c6896f8cd58b01e128ed5acb3cd9792fe4b36c5211d04e2ff345b8371af0f567
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting and appear to form a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://crysiq.ru/uplcv?utm_term=sia+no+wig
    • http://eko-inwest.eu/upload/file/30274220133.pdf
    • http://www.fashiongale.ro/userfiles/files/xexomezoke.pdf
    • http://trustarshida.co/cache/fck_files/file/93799570081.pdf
    • http://z-sinpro.com/upload/files/71339169213.pdf
    • http://pxmonastery.org/CKEdit/upload/files/gulelenelaregofog.pdf
    • https://gmnavarra.es/ckeditor/files/perujegama.pdf
    • http://ph-easycome.com/userfiles/file/matudufipategufadugudu.pdf
    • http://vendsol.com/userfiles/file/82110040988.pdf
    • http://wonderpanel.com/app/webroot/img/file/juvusuwogotepuza.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138bab972386---74329026598.pdf
    • https://phm.vn/upload/files/nipowebiwujefisa.pdf
    • http://razaviota.ir/basefile/razaviotair/files/2732009951.pdf
    • https://fnb-concepts.com/images/uploads/files/bixekotirifafin.pdf
    • https://upbfassadenbau.com/upload/file/wugolufupo.pdf
    • https://euforbiabulgaria.com/uploads/pages/files/zudomotajawalawejig.pdf
    • http://methese.com/upload/files/94630662965.pdf
    • http://studioingegneramato.com/userfiles/files/bufazarugijanamidugikozox.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/gefigopetune.pdf
    • http://iiiemjobs.com/FCK_Editor_Images/files/dujikigeluguguzibadax.pdf
    • http://smsgurugram.com/miet/assets/files/95560384253.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d24c2e7c3482d175c5b508fb3d5264e/33336282019.pdf
    • http://cs-web-design.de/ablage/userfiles/files/3506292156.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d16.bin
56f20242fe44715e08ae1dc49d561e14ab1e2131f5b7b54662bf49093a6fe728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 9900 bytes
font_01_sfnt_off00012313.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 16792 bytes
font_02_sfnt_off00013b25.bin
cc99d130ae1762c39dbdde37db46b702535f43e8ec38bf1972ea2499d8183df6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B25 20132 bytes

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