Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d92d188e09f8db4…

MALICIOUS

PDF

71.0 KB Created: 2021-09-16 22:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 82ef52ccaa34a22df1c9339929ed83a0 SHA-1: f425af5bfe19bd08d7d7d579394f1ba40dcd6213 SHA-256: 2d92d188e09f8db4e8d80ca0b8579c3203b684433d4e3027046a5def71146cb4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infotechsystemsonline.com/ital/www/img/file/739838897.pdf In PDF document text
    • https://vitanov.rs/files/wokakivagupodebomaze.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/82730061844.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/9931677555.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/2142713670.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/sipikurobi.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/wapejalepesuvepitu.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/birapewanolox.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/bomabimonaxusodamivikewa.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138326504c95---28082951949.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/bifofuximapebuxij.pdfIn PDF document text
    • http://tiquital.com/documentos/file/45936850797.pdfIn PDF document text
    • https://blv.by/upload/editor/files/xuwirisebutikoxabu.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/morawi.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/jenuxiloradelimuzojaniko.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/jebikureforofonil.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/50566623428.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/fijetipujugininumipo.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/misivelew.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/48241515634.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/93449948456.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fimufaruzojuw.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/67359145383.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379385f2544---59872279169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+let%27s+go+pikachu+game+download+apkPDF 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_off0000b3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D9 15812 bytes
SHA-256: ebfaf382643a6764cc9d0ed0889b16f9b39206a5707098b3d0a10a571bb61a70
font_01_sfnt_off0000dc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC01 11172 bytes
SHA-256: 568d62792818d7030e6af1ea56d96dbbf0159e530e95c24fd0ecf57a2ac8c7ae
font_02_sfnt_off0000f5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1