Malicious PDF — malware analysis report

Static analysis result for SHA-256 b086aed8b91971c7…

MALICIOUS

PDF

71.3 KB Created: 2021-09-19 17:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 325fdf632eb87c56ec48a6a6de230f16 SHA-1: 46cda773716ed2900c24c011f18965acac8f78f2 SHA-256: b086aed8b91971c7012ee03f3200457767cf79e615d527d04f9b808b10bef804
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 of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=dunkerque+pelicula+espa%C3%B1ol+latino PDF link annotation
    • http://czerwoneiczarne.pl/files/file/lovunexolaro.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/60550661094.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/14222448492.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/74196646560.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/zimuri.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/62626701402.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/80523314234.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/27987806846.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/vatirovusemusol.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/xexotekexovaduxerorilepe.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109060431475658.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109140606537290.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/linugakowopalotokudaveg.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/joxedupidoniwopi.pdfIn PDF document text
    • http://holzbau-napetschnig.at/belizugatufawanupuko.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/kefisonulixipusede.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/62963973055.pdfIn PDF document text
    • http://fnathservices.com/upload/file/tolulase.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/4ghdq2ad8pqfq411q6aub4h742/mefenuwasediveduxix.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145bffc14cad---40435703042.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/duvekegivo.pdfIn PDF document text
    • 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_off0000ae7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7F 10912 bytes
SHA-256: bada9e263231d3dac8016280bc30fe8777873025ecce08a387989126ec5d3e39
font_01_sfnt_off0000c7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AA 17904 bytes
SHA-256: aedb6eaac4f7b6c1e241ba8781476d92f004f53fad8b63585df8920c5a853c78
font_02_sfnt_off0000f5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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