Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedc360606821f24…

MALICIOUS

PDF

69.3 KB Created: 2021-10-07 05:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8c7766038eca107571c0364821ccf5fe SHA-1: 3fa252763cee06807609074b0c16a5e8490dc222 SHA-256: bedc360606821f2461569366ba58a1ce6199226e4264a81dcdac08bee0d13ea4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, including http://wu-pao.com/upfiles/editor/files/xikodimabad.pdf. While no scripts were explicitly extracted, the PDF structure and its association with link farms suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://wu-pao.com/upfiles/editor/files/xikodimabad.pdf In PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/jonebelolorefipetopulilip.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/2928616041.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/maginu.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/duwebejapi.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/97300994794.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/galumepafir.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/mitinurosobunakejoxelone.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109271605234927.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/rowerezip.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/kolomozozuvapob.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/vejuf.pdfIn PDF document text
    • http://leton.pl/userfiles/file/lagenewog.pdfIn PDF document text
    • https://mediaskills.rs/files/miluwubajuwatuja.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/29249721670.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/43839913325.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/58371225128.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/76840413045.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/28943991999.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/78919509920.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/japarelemale.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/nakixitusudi.pdfIn PDF document text
    • https://labelmarket.eu/data/file/64621431597.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613996c95204b---30394970237.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/03619daecb97fe1f4552e5ffe7587059/podimelimugifomidup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+much+do+commercial+lawyers+makePDF 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_off0000b29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB1 10816 bytes
SHA-256: fb19ff04577b0d9424303dfc2aa7c66cd4caeff8be3ff0dce9b9978633d0ac5b
font_02_sfnt_off0000e3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 14552 bytes
SHA-256: 01707cc592cee9a64934cf338e32a766bcb1046e005a8e477c7f26ee5924eb5a