Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9be0604c3ed4166…

MALICIOUS

PDF

81.2 KB Created: 2021-09-23 01:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d6ea5c17445af68cb0b7c5e149e7a6a SHA-1: e4587a733bbf2ad15c960dd2556474bc3104f401 SHA-256: c9be0604c3ed41665ef165772880f0ec78c5f919b85a1c325760f53aa258b968
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a deceptive tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=quicktime+android+screen+recording PDF link annotation
    • https://nhaccugiare24h.com/uploads/userfiles/file/63329562556.pdfIn PDF document text
    • https://gdaniec.com/upload/files/87195068972.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/parawekanedusi.pdfIn PDF document text
    • http://marketingnews.fr/images/file/fenimubetaxuzokefo.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/kebezopenefotonos.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/jeleliribifabes.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/63158026411.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/zajezani.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161302f8e87aa0---32147032366.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/15836472207.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/11374412537.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/zesopotaz.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/tiduwurijopetibusi.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/63752118135.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/gulivudesininavi.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/rageneraluxixetiwek.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/2021922189503620.pdfIn PDF document text
    • http://dhf-china.com/d/files/lupenokinetudisumepu.pdfIn PDF document text
    • https://novsport.com/content/File/nukonupazoli.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/rugimasufinakinupus.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/fajogubiranow.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/27475037151.pdfIn PDF document text
    • http://holzbau-napetschnig.at/66100117394.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_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 18108 bytes
SHA-256: c9334e781c319f45f74ebb55949e8dcd1b2c22c6b3e350a70923aacf4813c757
font_01_sfnt_off000105e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 10916 bytes
SHA-256: 8d70ec66b8221461f7ccd9f93cea821344699718b606b827b5699f35f7017d08

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