Malicious PDF — malware analysis report

Static analysis result for SHA-256 9183aa8576c0b59a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 03:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba44ffb31153ff5ae20a7bd6bbd5146b SHA-1: b2364b4ebd84694bdc60faac17a02cba130cc3ed SHA-256: 9183aa8576c0b59ab07fedaf20f9b73dd4960c7a05ce7ab2c4cdca1628640fb7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating the PDF's structure is optimized for search engines to promote these disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://drafthe.ru/uplcv?utm_term=best+apps+for+gamers+android PDF link annotation
    • http://educasters.co/ckfinder/userfiles/files/2737756739.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/77551739481.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/nirabezerivojinivile.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/12822489935.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/lanonolagarada.pdfIn PDF document text
    • http://kvrhousing.com/uploads/50834794806.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/93559794755.pdfIn PDF document text
    • http://www.toptehnik.si/images/868727206.pdfIn PDF document text
    • http://pololanna.com/user_img/files/40580027929.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/17170110724.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/xogifivebixamemulif.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/vebipoxarisoxobilew.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/xogatokidepotubirib.pdfIn PDF document text
    • http://trieuduong.com/images/Download/wasivegekukazovi.pdfIn PDF document text
    • https://orangerun.re/photo/files/99119672001.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/lagovibazazi.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/6870282629.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/livumalemupagusumotadedu.pdfIn PDF document text
    • https://il-gusto.com/images/file/ditasaguk.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614407e0a5cfa---20132460646.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/40271844120.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_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 17640 bytes
SHA-256: 8481e5392942232a4157814bd2ac410efab512721bcd46904292af0dd72660c8
font_01_sfnt_off000107d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D9 10848 bytes
SHA-256: 8b2bf753841c0dc41e3d0d58a679ba06ee9e83ac112ff340402b439271e0aa0a
font_02_sfnt_off000120ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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