Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d0509a9d5081e0…

MALICIOUS

PDF

84.8 KB Created: 2021-09-19 00:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6a792c911d0088d6cb22b99e2e1ad31 SHA-1: 0a7b5fd872ec07ce7fe8066f094054f73ba7af68 SHA-256: 39d0509a9d5081e0d0ea9a67c5330a4c4725a1f8f32a460a4220bb228f0f269e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://zeroseistudio.eu/userfiles/files/64080963099.pdf In PDF document text
    • http://mesterteto.hu/userfiles/file/woropaxa.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/demivenosukozox.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6142c4c0a2e1e.pdfIn PDF document text
    • http://domario.ru/userfiles/file/91751004168.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/vibijeniwopikejepeza.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/38280057942.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/65760358140.pdfIn PDF document text
    • http://posuni.com/userfiles/file/63881973727.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/xabiboromizejavideri.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/32598300713.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/68018995015.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/xejali.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/83646970506.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/37880280451.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/telelu.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/8828389334.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/96003403226.pdfIn PDF document text
    • https://zzhqhi.com/d/files/wizidagobutewedagewi.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/kinuvixikusurepefifasa.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/zukegidolafogiliv.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/85611596968.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/64746044344.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/rabolitixaguxefikasotoxag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+3+way+facetimePDF 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_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 10444 bytes
SHA-256: 5cc6cff89969170803d49d09934679249a3919397b0bc29480159817ba9ea6bc
font_01_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 18684 bytes
SHA-256: 17477d88a152318ce133ceb82bae7d7f5fd528d336dfcc8dca20260e91d5b751