Malicious PDF — malware analysis report

Static analysis result for SHA-256 e666a5bf9e3f7563…

MALICIOUS

PDF

62.3 KB Created: 2021-09-09 11:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 96a5415302924d4fe23f2fb3cd432396 SHA-1: a08790cd3ccedaedc5ba1becfb82968d84b4ad0e SHA-256: e666a5bf9e3f7563ecc3ee497b962c013dd29831a4e1d01b59be2ae62a312dfc
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in exploiting vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6567

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.
  • 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
  • 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://coretry.ru/uplcv?utm_term=prince+of+persia+1+pc+game+download PDF link annotation
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/dilix.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/fakomuzutagebidewuwotewu.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/51519952968.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/koluvise.pdfIn PDF document text
    • https://0900107678.com/upload/file/fopemu.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/lawekulijenapavel.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/naniluzinibutamibulala.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/xalegatomaboz.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/66210160685.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/vakiwakaloterusojapit.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/65031144315.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/42163656461.pdfIn PDF document text
    • http://greenld.com/userfiles/90561624355.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c3b53b6e---84300205824.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d031981c6---62112399321.pdfIn PDF document text
    • https://hojoairport.com/images/file/20406861734.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/69072608882.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/13602180724.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/xugixerubowukon.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/xegurikitasoperulu.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/69795662524.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/zimebibosafa.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/64885614493.pdfIn PDF document text
    • http://beta-rc.com/upload/files/meminaxabateje.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D8 16432 bytes
SHA-256: 636973ad76f434466ef38c95a35ec7c1b742b52198e62801182785b339d59be5
font_01_sfnt_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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