Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5b9e9c785b0020…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 11:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3908b4150aa6ae61e490fb2301eab795 SHA-1: 77b1dd288802dbc7049468e8564751261304a4ff SHA-256: 0f5b9e9c785b0020c9ae3ac4d49ffecda673d127de0ca930fba44aaef5df3be4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which is a common technique for distributing malicious content or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://amindoost.ir/images/upload/files/27508651760.pdf In PDF document text
    • http://matsonconstruction.net/userfiles/file/nerofexulopeforuposevenij.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/32078608009.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/49490456798.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409303aa148---40831941879.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/nalojuwitemomuvetosibeku.pdfIn PDF document text
    • http://vinmexindia.com/uploads/1663473655.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/gosujenasifigubaleserobin.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/21723721836.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tmjtgj9c5me53lgo6gkd63nj56/zorimixexabaveramuxaw.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/87637284404.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/xugugu.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/warofepovutit.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/xazix.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/8919110430.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/zerefotitibavopawame.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/ruduviboxaweburibomawopep.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/modelokorofuka.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/difujexowubelafifanegaxot.pdfIn PDF document text
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/rujeru.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/givaloxolamud.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/8756639077.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/sowexaj.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/zeposorafavegofinosola.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/fulubilusefetaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cookie+clicker+wiki+upgradesPDF 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_off0000ce84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE84 10796 bytes
SHA-256: bcbcbc7e8d916bcbe4e88235ca585d0c0cd26e43acc8e48ddd7661e37f199c83
font_01_sfnt_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 19112 bytes
SHA-256: e2841d415cd1d6efdc8c05a177215893e4c61d23e52788181d82634e6ed06555