Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43f88576b380018…

MALICIOUS

PDF

93.5 KB Created: 2021-09-16 20:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0afd3b366de6aeda675424aed569d63b SHA-1: b33eb90d8cd811be888113e0baf5a34f40b3f3af SHA-256: f43f88576b38001876d2cd257e0b877030f8e2b25170972d87a7854562ee9d7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to various domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan PDF. The presence of external URIs and the 'link farm' heuristic further support the conclusion that this document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://nomylo.ru/uplcv?utm_term=how+to+leave+hialeah+pdf
    • https://autoroman-service.ro/imagini_ws/79401923672.pdf
    • http://eviljoy.com/UserFiles/File/fimixo.pdf
    • https://traffictkt.com/viking1/uploads/files/vurepotapo.pdf
    • https://kattliv.com/kattliv/admin/userfiles/file/1700462444.pdf
    • https://vanchuyenduongsat.vn/upload/files/32901703412.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/dobanibumoseraralax.pdf
    • https://cicadit.ro/UserFiles/file/faginubo.pdf
    • http://mail-business.ru/uploads/file/24066178310.pdf
    • https://verredistri.fr/xmedia/file/robubigefuvopovaka.pdf
    • https://www.thaiahpa.com/flash/files/savogawako.pdf
    • http://dentalcenterstudio.it/userfiles/files/73534501326.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/2153e32ebf80c44f328d00a2b26c3f04/41851006288.pdf
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/satotaxidodikuvefoxajur.pdf
    • http://kvbm.org/pds/userfiles/files/80915397712.pdf
    • http://thuephotocopytaihanoi.com/upload/files/zedanenujiwagenoj.pdf
    • https://cambodiadriverservice.com/userfiles/file/walabekibuxifevakenap.pdf
    • https://konzolstudio.ro/uploaded_files/file/vawogotuganalesubadonise.pdf
    • https://somos.co/dleyes/admin/fotos/file/dizufisedegi.pdf
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/92062630771.pdf
    • https://manuscripthandler.com/userfiles/file/fujavaweraxagoduxapom.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_off000106fa.bin
4d7479829f864bc857d9f05b5972b213fd86f384f3a54c65691a9bea2f06560e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 19680 bytes
font_01_sfnt_off0001391f.bin
2b71cb2884f1f96329862ad13336d28c9fa8a22dc1b6a0d9439ed973adf858a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1391F 10364 bytes
font_02_sfnt_off000150a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150A4 16792 bytes

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