Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f152fdea3eb51b…

MALICIOUS

PDF

81.0 KB Created: 2021-10-09 04:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 032cccba2558ecaa19b20198062ba7c1 SHA-1: be6376146355e107461fbc244971fae0116e942e SHA-256: e5f152fdea3eb51badd29747872a19bcb087621ba85b8ec922fe36b65f942cff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and the classification as a link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=fallacy+of+reduction PDF link annotation
    • http://myslizdrave.com/soubory/62260803411.pdfIn PDF document text
    • https://norservis.cz/files/files/fewuditaburekojusetubuvo.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/37264435170.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/3562907732.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/31863549700.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/tekanaxez.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613791aa5066d---46833616278.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/79139025272.pdfIn PDF document text
    • https://shidoremicrosys.com/media/tesimagudixaduwuwake.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/93648477349.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/koreresabavavixabezulu.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/73836014744.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/sezufujofufevobaregisi.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/napibipuxajenibugi.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/bazizudijiza.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/33944748266.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/30891492997.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/88767635264.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/15389694688.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ih0edlljkhrr4sed2gqseuagq3/lamifesokojelekonari.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/dufoli.pdfIn PDF document text
    • http://dobosugyvedkecskemet.hu/userfiles/file/vulewijoxomulobufegifa.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/82353332316.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/15856732716.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/wopiboruwo.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_off0000d5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 19056 bytes
SHA-256: bb175b21454d62f3daa7a29f3ccc809e1ee78217799a6ed739a7bad4514916d6
font_02_sfnt_off00011ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE1 10492 bytes
SHA-256: 545f51b8b376f2ca4a60d0ed00f47b67d22ce1620757e9cf72d374137ad3753f