Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a89ff122684f1a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-14 06:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 71e54926a3e51ec8978806597f95fa74 SHA-1: aeb07deeebcb98801c88c938183d4f679e11d8bb SHA-256: 40a89ff122684f1a091cbf01912c415401a93db9de284b589e21e814696af5fe
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing unwanted software. Numerous unknown URLs were extracted, suggesting a link farm or redirection mechanism to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://edmo-cars.nl/images/file/2758592904.pdf In PDF document text
    • http://canxetaianhduc.com/images/file/sanabexenegijawidodejudo.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/47877943840.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/juxewikup.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210913045603.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/vajunaxe.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/xenumoxufofajexediletiji.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/22394000938.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/pupiwevadizinejaxobij.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630696286bAmK.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/64710701018.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/71761169791.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d332437a6---81961794682.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/35178556063.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/36761078111.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/97851181316.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/vigeturekalapofo.pdfIn PDF document text
    • https://apluskleaning.com/admin/images/file/xodam.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9f3cc094---togiwijerumomov.pdfIn PDF document text
    • http://goodmax.ru/i/files/22799922455.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/51835687930.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/tezozazixijedajefaj.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/47454756994.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/purimemazutowotezakutakem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+transfer+android+data+to+iosPDF 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_off0000d549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD549 16696 bytes
SHA-256: b9d8b62fe151dafb17c82064b2883b04df74695f820ccfcae74a523d7d51a547
font_01_sfnt_off00010047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 10380 bytes
SHA-256: 5cb4e7312988d1851ff25f69a931eefcb3fb91419aa85df2946e117987d4de7e
font_02_sfnt_off000117e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1