Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7bc7f719e5de89…

MALICIOUS

PDF

76.8 KB Created: 2021-09-20 13:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 838332b4dc568ff62df513290f7f801d SHA-1: 17b4022b9f81ca025597d62ecbcc0ce5026859cf SHA-256: 2d7bc7f719e5de89070f9554a0a064dfa9bb16f53a35d81d44b88300853212f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs pointing to disposable domains, indicating a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious websites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://oniceh.ru/uplcv?utm_term=graphing+quadratics+using+vertex+form PDF link annotation
    • http://vipnovini.bg/root/f/uploads/files/figan.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/webebezasifeseguk.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/wagoparekiti.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090807441873499.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/13853426655.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/56027757342.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/66120346406.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/safumulibubavotiroju.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/49334702165.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/wojebevikapexeje.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/12411579365.pdfIn PDF document text
    • http://fitviewer.com/files/file/zetewawa.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/xepabopiragowixorulasoli.pdfIn PDF document text
    • http://kaies.net/upfiles/210907005719028091peps9x.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/davubebukajawubetovewam.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8a84f0861a85b38ce472737041de28da/visopizafira.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/59319455759.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/78181606504.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/19383772825.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/48747435086.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/xanizezebozivodimududuw.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e8f61c133---zolafikuvelividazovu.pdfIn PDF document text
    • https://servicio-mexico.com/images/file/birefuloz.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_off0000c3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC3 11476 bytes
SHA-256: e3fb5c5c01a6d632eec03125890dd65ec80dff6bfe7499abba7ef835b07931ea
font_02_sfnt_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 18172 bytes
SHA-256: 9d637ac986e447aa42f5188a586464da48c6213c36263e0f09ecf27d34760e3c