Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2a0e089b0c00dc…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 23:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5e7da6d92bd3db79d27222aa3493678 SHA-1: 9e7b0f2a2721aeef3348f54e12d8837f33428e8b SHA-256: 1b2a0e089b0c00dc2c9d19524042701cd0d37c570d2f9f2dfc67c8a416db489b
166 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to potentially malicious domains, and exhibits characteristics of a link farm designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests it may also be used to trick users into providing passwords for encrypted archives, a common tactic for evading gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://biemmecommerciale.eu/userfiles/files/lotefuwiwof.pdf
    • http://sudeoksa.com/userfiles/file/20210906030515.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d94ee03a8---46004428595.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/navorataxi.pdf
    • http://hooleihomes.com/cms_images/file/82383815982.pdf
    • http://exteractif.fr/pictures/2/bifiw.pdf
    • http://hebammenglueck.de/ckfinder/userfiles/files/nuwezajerukebedoxitotita.pdf
    • http://kvrhousing.com/uploads/33825615082.pdf
    • https://oxi-dental.ro/imagini_ws/rirewuniwupajezarasataxef.pdf
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/33218863086.pdf
    • http://knuhpharm.kr/userfiles/file/20210917065527.pdf
    • https://hotnewsmd.deca.md/upload/userfiles/files/18265037317.pdf
    • http://jshanwoo.com/ckfinder/userfiles/files/gowelebesilivedexuxi.pdf
    • http://onfireinteriors.com/userfiles/xulatasuwobobogafifejotis.pdf
    • http://saddabro.com/userfiles/file/gamojelisuxawezuvoku.pdf
    • http://rmgoals.com/userfiles/files/kubanep.pdf
    • http://blpest.com/UserFiles/file/86802695246.pdf
    • http://digifast.cz/userfiles/7088095019.pdf
    • https://stvorki.ru/files/file/41664069593.pdf
    • https://cabsfromheathrow.com/userfiles/file/25803885389.pdf
    • http://winhazel.com/indigo/ckfinder/userfiles/files/jefixo.pdf
    • https://vinocastillo.hu/editor_up/51346822745.pdf
    • http://gilendor.cz/userfiles/file/1748480385.pdf
    • http://jshanwoo.com/ckfinder/userfiles/files/kakuvanoj.pdf
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/jefobitizis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=simpsons+tapped+out+donut+hack+no+jailbreak+no+survey+no+password
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0d1.bin
41467baae8c94857ad751b726f4f0ea8b77f17a0470dd1b167c91d4a7cc2ef0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D1 11584 bytes
font_01_sfnt_off0000ebe2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE2 16792 bytes
font_02_sfnt_off000103f4.bin
ca285644e02e086cca45282d4dacf279f4646131a937b3c12f2578eaf1c2e856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 16256 bytes

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