Malicious PDF — malware analysis report

Static analysis result for SHA-256 6592ff6b4f23bc1f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 19:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 675ff0504986840cf4be613dcbdd3815 SHA-1: 2695352edd8c870b6e8d5a2da7449af24f3d0523 SHA-256: 6592ff6b4f23bc1f4fe9dbaea2472002714e5b1ed7984960d86280b7efecb345
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious domains. The PDF's structure and the presence of many links suggest it's a link farm designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coretry.ru/uplcv?utm_term=orient+express+pdf PDF link annotation
    • https://hitourkorea.com/FileData/ckfinder/files/20210909_E4AD1651210A96E7.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/xived.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/guzilo.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/xupuzefikadinija.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b96c270f---mudaxorebenotiro.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/58904956294.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/kanimifebakedalox.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/gevaxuvepe.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/jodezurudasobenuxudejuki.pdfIn PDF document text
    • http://www.bandungmesin.com/file/xiwufubesalibem.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/47848019782.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/14368116021.pdfIn PDF document text
    • https://baongochoa.com/upload/file/beronoxarojokevesovasov.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/25156340404.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/raxodaxetazimabalijaboko.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/14271670428.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/sozaxogapulikonagok.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/sukojotibogi.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/xadop.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/jigok.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/2mvmr1cq3ibdia32e48d865tmk/rapij.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/zulusoratovo.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/99889020159.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/21930349556.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/71260381455.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_off0000d517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD517 17216 bytes
SHA-256: 75df673cf74adc12c448eff33f1c095e367307409f44095c818669a2f192b269
font_01_sfnt_off000101ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E1 10288 bytes
SHA-256: 9358134a055d815d1fe5a3d8b99078e9ba9ce5e599daf605999f1d3ebc70e8a0