Malicious PDF — malware analysis report

Static analysis result for SHA-256 392f73e1da84f723…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 00:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b87e86b86af1367a2265099878ee1dd SHA-1: 20bb0075ed1bdd929945149869d6d2adeefb5159 SHA-256: 392f73e1da84f723a2c309d2f611a26c0bb6fd98a2a57d8edb7dd3b8427b5e89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a significant heuristic identifying it as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://irlanc.ru/uplcv?utm_term=free+online+movie+streaming+sites+illegal PDF link annotation
    • http://lungshingcentre.com/userfiles/91588772770.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/suwifa.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/nutagonepepa.pdfIn PDF document text
    • http://innotack.com/userfiles/files/woxere.pdfIn PDF document text
    • http://retailjewellerindiaawards.com/userfiles/file/47759882678.pdfIn PDF document text
    • http://micruts.org/userfiles/file/dutovodavinuj.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/fojibuse.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8b4c965c0---farofegogujode.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/bowopowawibinurud.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/8868928792.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/bumurideredowavesomek.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/pemaxaduxenariwup.pdfIn PDF document text
    • http://aven.su/userfiles/file/87279023537.pdfIn PDF document text
    • http://mlead.net/images/e/file/gazemofetexavi.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/pamupawepikaf.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/67694600730.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357536b63c7---59061919038.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/39210001748.pdfIn PDF document text
    • https://www.renouer-auxerre.com/ckfinder/userfiles/files/xulufoditu.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/89386974574.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/tipetox.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_off0000aebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBE 16012 bytes
SHA-256: 7912d8005f2981174ce4fbfdeef11914a6f182a3537adbba93c1fed0fdb26061
font_01_sfnt_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 10492 bytes
SHA-256: a967dd1d5b38127aa195847c54aa1490622b865a555c7ef5a648c81123f20e40
font_02_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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