Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cbdaa48c010ab6…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 07:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d3c6f96f83b7efa3339805351c07a491 SHA-1: df5020e6a427e5cb7a2f6a9ff38ae19b18b5e477 SHA-256: b8cbdaa48c010ab6a7c4dc4c30c869c7ae1a8093224fb286bd2f3889272b5b54
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains and are used in a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=free+office+suite+for+windows+7 PDF link annotation
    • http://dxline.eu/userfiles/file/lejegowiludox.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/dakamevuben.pdfIn PDF document text
    • http://champagne-ardenne.annuaire-regional.com/ckfinder/userfiles/files/mesukazizurofogef.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ced217ef9---89187438915.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/famekabedafalob.pdfIn PDF document text
    • https://people11people.com/uploads/File/sodirik.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/51478521543.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e301059284---11436029082.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/98153668087.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109130621579690.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/bukotexisagedijib.pdfIn PDF document text
    • http://goref.ru/files/file/5300733427.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/vobudowekavi.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/butef.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/tefanufimasi.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/21715139547.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/39131663051.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/9432781482.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/duganisijejajedamodexiw.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/jevawewil.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/91826104391.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/44373212457.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/salada.pdfIn PDF document text
    • http://recrute.fr/files/files/jadutoxonuropupulutakod.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210919120234.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_off0000b52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 10476 bytes
SHA-256: 7aab2b2a90c4f71a4a2e5613141f1af6a3837cfe34a6c39bd72143f672fc73da
font_02_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 17860 bytes
SHA-256: 56a95b18b06fc4f67c574fe9e6b7b600c40c451bda73f9588c136fba3ce090af