Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ed0a6289d0a87c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 04:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3915a9de5522da8b34a4249468caad01 SHA-1: 16ab8eaca71252a0411e9f0b41e6003a885c8e00 SHA-256: b5ed0a6289d0a87c17c567c5117c8913b4c0775521cbd373b5cbaa622fe5fb36
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by an ML classifier with high confidence. It contains numerous external URIs pointing to various domains, many of which appear to be part of a link farm. One notable URL, 'https://pistant.ru/uplcv?utm_term=download+captain+tsubasa+ps1', suggests a lure to download content related to a game, while other embedded links lead to disposable hosting. This indicates a phishing or social engineering attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 4

  • 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://pistant.ru/uplcv?utm_term=download+captain+tsubasa+ps1 PDF link annotation
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/lasutoxe.pdfIn PDF document text
    • http://quetthe.com/upload/files/29964703785.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/zagizowilulozuxaj.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c66376b66---bogaboremodizesem.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/46389486889.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/zigasoxufisusokezeg.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fcaa7d2f1---73574921034.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/litomivalikibipajanug.pdfIn PDF document text
    • https://dacola.com/upload/files/33046397526.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210919081730.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/wolumuzizepaveni.pdfIn PDF document text
    • http://zeci.nl/im/image/nokepisutadarepekelex.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/garejamanemuwowunodi.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/50537404529.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/zelagegujej.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/99889608072.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/98785117241.pdfIn PDF document text
    • http://travellerisland.com/files/53532676061.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/nipujokumebovoxas.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/vosovepilol.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jovuxefimubamopoles.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/posukudu.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/fixoneke.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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 10652 bytes
SHA-256: 71a85e4d7dc5085b003fe5ecc766b05bcd69d326b42dfb1cb628065f179cd3d9
font_01_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 17952 bytes
SHA-256: ed970acfc1bc1fa9b152fd9e123bdd0ff38fdf62b23ce12b0d8a5472248a3370

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