Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba25ebaad95ee2ff…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 02:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f85ca0706ce87c77c66a8806d4d5d49e SHA-1: 317aa53ad16ac138d3ed3f1424b62d39a29c854c SHA-256: ba25ebaad95ee2ffb034d0bab47d68f50e02a8f9766394fbf2769e8acc4f64b2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting and are used in a link farm pattern. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://philabc.ru/uplcv?utm_term=all+mario+kart+ds+unlockables PDF link annotation
    • https://webmedcentralplus.com/userfiles/file/75227147699.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/66730323359.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109171318054915.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/19429819845.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wefavopewajonarakak.pdfIn PDF document text
    • http://wych123.com/upload/files/68156361422.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614100df0b8f0---burabisexujulikarizov.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/vetilumonisipadevonul.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/38668561904.pdfIn PDF document text
    • https://krusomying.com/data/file/77629779313.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/34477796277.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ginusir.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139688e42ec3---32262520602.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/11187701022.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/mekudopirowizusubilebojok.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/towivinaw.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/85152085629.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/dezokuparupegilelexa.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/rodipux.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/gitokijerixesok.pdfIn PDF document text
    • http://skisun.it/userfiles/files/81284494734.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/20661622204.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/giwemotokig.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/43081985298.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_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 10844 bytes
SHA-256: 1c07ad6021f7e78ce8938df27381178e1a50fec779f491cbc171fe4cf1bbd831
font_02_sfnt_off00011083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 17812 bytes
SHA-256: 177469455752cf4abdc2d636af85b141a5e009ea303e86c80054978959ef8357

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