Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b4d8df39eb1009…

MALICIOUS

PDF

93.6 KB Created: 2021-09-22 17:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78ff664bf7454eab31c9e3c318b0a9be SHA-1: 86d3467813a9e5b9879d681ee351f0a6074010f6 SHA-256: c7b4d8df39eb1009db5c9e37ef49842855baf4911ef1c06c05b8abf77fde6a0a
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to interact with external resources. Heuristics indicate it functions as a link farm and employs social engineering lures for advance-fee scams and browser extension installations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to download or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • 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://yuktogel.com/contents/files/sewezapabebiguluwobi.pdf
    • https://j26clean.com/upload/files/80715655319.pdf
    • https://m-isc.com/userfiles/file/mopapifijipexubovakozepil.pdf
    • https://samsungklimamodelleri.com/upload/ckfinder/files/705826802.pdf
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/miratiwetogut.pdf
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/47454659397.pdf
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/buvomar.pdf
    • http://sanzmendia.com/userfiles/files/sowutevaz.pdf
    • http://cdmvt.cz/sites/default/files/39070375528.pdf
    • http://to-tuong.com/media/ckfinder/files/54342606558.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2fc156bf5310dbb889c57b4c93c5863d/zalikorijo.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/31288978331.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/zomujusexatepafinuwokepo.pdf
    • http://ariogalospspc.lt/userfiles/file/26334876557.pdf
    • https://rippa.pt/files/file/limoferuzoronarek.pdf
    • http://leprofit.ee/cmsfile/contentfiles/27481968507.pdf
    • http://ingpoggi.eu/userfiles/files/sixisuzebapufogoxisosika.pdf
    • https://caraudioshop.ro/mm/file/gozesilefokizesexina.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/kipelew.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6f0bf29938a98eeb86b5fd876738c22a/dakuwofuredarupisonawu.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/futorupezopegamijosapim.pdf
    • http://velo.hu/UserFiles/file/73177221126.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=is+fire+tv+better+than+firestick
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001091d.bin
1dc0663a671a4eb175ad670a93daa33348ccdc3d024e92b353418360f5f1f91a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1091D 18352 bytes
font_01_sfnt_off00013880.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13880 16792 bytes
font_02_sfnt_off00015097.bin
31f4dc658a20b4b8133c8176e6c0455ad87670ca4014b2a3c12afd39fbe970dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x15097 10516 bytes