Malicious PDF — malware analysis report

Static analysis result for SHA-256 10305aa1e128e608…

MALICIOUS

PDF

77.7 KB Created: 2021-09-11 21:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b3531ea58aa80df23101b7fed077e580 SHA-1: bece62f71d9b470cc0ea6fba8fea273e5fce5a6f SHA-256: 10305aa1e128e6082af80cd883850199f070562ccef83cafd0edbd02f0526912
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it acts as a downloader or redirects users to phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=bloons+td+6+mod+apk+android PDF link annotation
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/21479396583.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/60102822988.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/64613968041.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/koxemanogo.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/38179748599.pdfIn PDF document text
    • http://tzsunup.com/upload/75761846215.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/mixevozavalixoda.pdfIn PDF document text
    • http://nineslash.com/user_file/file/zuzawebo.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/23133951874.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/85842660549.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/49945728077.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/35188236461.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/33015953258.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/nevulepudutofikapugozu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d162cb4eb615941d4c46d4a1b67c2e63/16052017451.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/95419053752.pdfIn PDF document text
    • http://artepcb.com/upload/files/kutezagefexegutamagime.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135492adf49a---13209521226.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/mimasubaxukujoga.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090514190573499.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/80807362864.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/kewoduzil.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/jitonesabarafedivavevanuz.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/93827101375.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_off0000caf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF2 17456 bytes
SHA-256: b9e3e0610645f851030741fd49acbde72d54edf4c51fd197958612f4dbfd711b
font_01_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001105e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 10736 bytes
SHA-256: 00ac76291a6a2040afee23de63e6adb633d98a95bc74c843726d0c2abaa8ea41

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