Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76a96e176f4db17…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 17:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 7a5c238acf54bf3d384a9072de1ccced SHA-1: f6a259ca61ac81ac75474b27954ed007bcb51731 SHA-256: a76a96e176f4db17d7cdd57976cb7ad79e88bd179c871704e9778b693865db3e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://qwerty.pl/_data/file/dabujokimo.pdf In PDF document text
    • http://sharon-barron.com/userfiles/files/punik.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/logitewoxamebipuwepo.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/43969644532.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/gulododo.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/bijanasu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/87350552564.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/39207399779.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/majojexezoje.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/1396097337.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/tulibinijofolatisika.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/pizuretumezenodu.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/xagaliradizovixat.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/zatamabuvumugewojuzitez.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/7514452428.pdfIn PDF document text
    • http://generoussecurity.com/uploads/86189255913.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/50990254011.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca0e25150---dudoxonamotowurokufusuwe.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/kisabeguzozogixozevifixij.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/96251628187.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/62760870665.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/78182983319.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/701d79e589fa7dc470772528b5038c9e/96035216921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+clue+apkPDF 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_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 18336 bytes
SHA-256: c62eeae2b808f061b0fba185a0697e61eaace7aee5b720b8849fa0c610cbf55e
font_01_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 10328 bytes
SHA-256: 584d9fc52abd7f40bcd900edfbbca000d74f0d98598678b1dbde68ce44ee76c7