Malicious PDF — malware analysis report

Static analysis result for SHA-256 9036c601fd62943f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 15:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9baa1b691faeebc81da471fe1428ffe SHA-1: ecea02753b20f7ef1ad9f13a9dac2cbc522e944a SHA-256: 9036c601fd62943f46b7880c05a05e8c2c3f7c7fb91c362b7d5998f80c33a10e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to malicious sites or download further payloads. The presence of a 'download button' heuristic further supports a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=transfert+fichier+pc+vers+android+wifi PDF link annotation
    • http://aiswaryamatrimonials.com/fck_uploads/file/nunikiwuxezuwegadu.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/76076006750.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/27873887969.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210905210144.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/vawujeri.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/sawodinesemorudafotiw.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/638ffbf227512d33c6e9d1fdf988545b/83005797777.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/gaxowovoleworagodakodu.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/45000285532.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/zilaz.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/numufukovanibiveto.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/nosazajenagamut.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/vatowevonilowovexu.pdfIn PDF document text
    • https://kimcert.net/E/file/xovawofi.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/89857713198.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/pufov.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/fogonarobomisolunen.pdfIn PDF document text
    • https://loyd.rs/images/file/bobavakepijofaguziwoked.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/35843204884.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/54367445686.pdfIn PDF document text
    • http://partnercable.com/files/71039206624.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/37999145184.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/50052110956.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/jetiwipinunepitulelamep.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/mimazojezafonubasiwebulo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613540f066e2b---pebatuzuvafolekorowi.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_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 10788 bytes
SHA-256: 0e24db75078694a867d868ab1d6c717405d8b09554608dd27cd650fbd221568b
font_01_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 17508 bytes
SHA-256: 80a93c434930a4273d5ed2a501114808ba921605be492b9a2bff2f3c39747367
font_02_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1