Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d70ae48d1e7a8b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 02:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 606362c090a1b50f238acc21c2444fa4 SHA-1: 5f036f8b7f16a7d029296fbe7ac2f3ded69d6f91 SHA-256: a8d70ae48d1e7a8beaca6ebad037b6ce7ad03c181f7af7f32a93a1e12506ab26
226 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It specifically attempts to trick users into installing browser extensions or revealing sensitive recovery information, which are common tactics for credential theft or malware deployment. The presence of numerous links to PDF files on potentially disposable hosting further supports a phishing or malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 http://group-anons.ru/userfiles/files/pawij.pdf In PDF document text
    • https://mimzyonline.com/userfiles/file/16734400334.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/94798184294.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/25812376739.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/88862969515.pdfIn PDF document text
    • https://webaprint.be/img/file/17195009821.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/46508863326.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/dugowaro.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ihk8p7pmu8pvrhu1m5fpbg644l/jugewamebumawipisokusu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6289cbdf1c7357d77d32b55f911e6fc6/jetureg.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/23193375991.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/83638825942.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/67068574625.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/weladozobu.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/vawobajabedateku.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/nokebapak.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/lezivodiwibirotoropikede.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/nevewekijusigajuzuwa.pdfIn PDF document text
    • http://myphamasia.net/upload/files/86669829175.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/33396932792.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/tasovanofatifuz.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/depedorujesot.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/wivubirigelulupebaxe.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/27224201222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chrome+passwords+androidPDF 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_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 10628 bytes
SHA-256: f143c9cc73579bd40dc0dc6b8a507946334e27766d9b2c88d901f0f07bf203ff
font_01_sfnt_off0000efb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C8 17348 bytes
SHA-256: 0a4dc9d524fdd31b55b0c65aabb3b4d4579f3cec2152903406e1440ca5816cb9