Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ca4008d8a64ddd…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 18:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: afdb44eb7f9a9e391edacf631e5bf565 SHA-1: bee41575fd4b0e29a9e69a12ecf147a06b826316 SHA-256: a3ca4008d8a64ddd8cf0b89fd18f85942b4de918d18ff5737300e26716666fd7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a social-engineering lure to trick users into installing a browser extension or update, a common method for malware delivery. The document contains numerous external URIs, including one pointing to a potential downloader or command-and-control server.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://drafthe.ru/uplcv?utm_term=motorbike+traffic+and+drag+racing+hack+apk PDF link annotation
    • http://cukrarnakolbaba.eu/obrazky/files/84873363588.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/4731368814.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/welajirubuzixi.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/42646417713.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/delalinajosetenosexarajar.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210904110636.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134dc780e3d4---fugudutosupinutepuwubozaw.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/48580315774.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/92963288535.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/44920891993.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/karimuxibikikuvavewa.pdfIn PDF document text
    • http://muszempilla.com/files/file/65099291005.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/totipituzivexomilomi.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141646b9def8---bekizifubirepexosiv.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/gugugoda.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/20161543723.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/kavipimikasifipapef.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/62554253969.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/pololiwa.pdfIn PDF document text
    • https://avenue102.com/uploads/file/delipiwazutudewolutab.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/tidara.pdfIn PDF document text
    • http://stefani.cz/fck/file/23367275752.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/safosojiruk.pdfIn 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_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 10912 bytes
SHA-256: 0bf8055c64d1723d3751061a5a1056525261aca8e287d9937c30dc01faa9c75f
font_01_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 18036 bytes
SHA-256: 7a3898a64541738076b7b7b18715d7a66b27bd1252fe6b1ac5f4627ff25eaf88
font_02_sfnt_off00011d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1