Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dcaf234dcefbf3…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 12:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d749fc84671d60fafc43d80400b4fb1 SHA-1: 0342b9b4d33c70347a52d9dae338c0d7db58099c SHA-256: b7dcaf234dcefbf333815136fe4f0caea9b332ab11bbe77db4694b919a6dcb01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are part of a link farm designed to redirect users, with one specific URL pointing to a file hosted on art-sketch.ru. The presence of a link farm and the ML detection strongly suggest a phishing attempt or a downloader for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7e1153b9412fe312f93e77373ec5605e/76855232361.pdf In PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xulurivup.pdfIn PDF document text
    • http://topstec.com/d/files/jofoninariwuzukevelowedev.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/karikidex.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/razilelapaxovege.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109070147514001.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/vefazaxajumuseniripugas.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/bikuxilipadixixebuvepiwa.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/53014150967.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/53314477154.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/40914956773.pdfIn PDF document text
    • https://ayurmitra.com/files/file/lazemivivesarit.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/2109120911575605728bot9.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/sefuge.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/vinesodosaxavakoxe.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/20436522535.pdfIn PDF document text
    • https://bloc-immo.com/images/kasupasuzek.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/24237131860.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/66682126050.pdfIn PDF document text
    • http://hkalc.com/userfiles/45615118131.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/70313362082.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/34433086481.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/robatugilijimifovif.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/vosinelodinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=infinity+ops+game+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7C 10892 bytes
SHA-256: a8755f801e60d0f118330a35ce9102b9a83014f81c1a75143b292547bd7e17fb
font_01_sfnt_off0000c78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78F 14960 bytes
SHA-256: 2c27c13e9a374090f0ac67999cf3e52ff54d6a368545ecad42fed0deabcd5348
font_02_sfnt_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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