Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f13fd690906aa5f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 13:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 690087d4794156cf52bd097021f3b802 SHA-1: c1cc7dd031bced0a775880881ab948cf7d49a925 SHA-256: 8f13fd690906aa5f7102d4b18de3c69ed99ebabeb500aa32801b771c4c4edfc6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=what+is+my+ip+address+apk PDF link annotation
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/cfed6c336a49df9e403c7081f5d08310/81071210268.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/11449081789.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/20159352235.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/29708946117.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/19593589031.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/15880304557.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161346d2359e06---dapasevir.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/botikizefawapet.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/movev.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/bilukotuwibudowaf.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/57245893572.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/2122906021.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/20222105130.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/42153895809.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/45215801372.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/32962760424.pdfIn PDF document text
    • http://semanbio.com/upload/files/61431570119.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/40814577767.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/dugodapaginutupo.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/kikutotimiremimewivi.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/27494958306.pdfIn PDF document text
    • http://fxlcd.com/upload/file/21618139841.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/40209939334.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_off0000cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 10584 bytes
SHA-256: dbea1fa5df91cb0f58121771854a881272b02a80dab946f2dc5237e0dea77873
font_02_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 17812 bytes
SHA-256: 65bcd2f8ee1e8e7698b8db34a133f08f3f57f8a017b0f46c417465ee0471a10a

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