Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a619551d566152…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 00:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37d6944462e5230aad10e52d7b4f12f9 SHA-1: 2d8cc2bcf879e1ec0b6e0d063757d616e70542d2 SHA-256: b7a619551d566152f37a62f3525dc9b27fe65d856576a7e2f39ad101df5cbc6b
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs that form a link farm, directing users to various PDF files hosted on different domains. This structure suggests an attempt to obscure the true malicious intent and potentially distribute further malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://sacc-la-chaux-de-fonds.ch/fichiers/file/takazejopalilaga.pdf
    • https://groupburuemas2.com/contents/files/fepizetizozufugudetamas.pdf
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/26509293259.pdf
    • http://manuale.aziendasulweb.it/userfiles/files/jasolixejewi.pdf
    • http://ausafe.net/images/art/files/3726925217.pdf
    • http://motorlustor.net/userfiles/file/13832075065.pdf
    • http://lovec.bg/root/ckfinder/userfiles/files/dupovabesesodawewe.pdf
    • https://hahapediatric.com/uploads/files/202109081428006231.pdf
    • http://webmba.fr/client/logo/file/34292783391.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16146576d39d99---xapipug.pdf
    • https://lotusmarinevn.com/upload/files/64776089314.pdf
    • https://pointvirgule.ca/upload/editor/file/pudomadobazakonaxes.pdf
    • http://knshzj.com/CKEdit/upload/files/44750097999.pdf
    • https://luminex.pl/upload/file/suxen.pdf
    • http://rotang.net/userfiles/file/25647029495.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3boeahs6k3kjqmk921eobpopa5/56368521433.pdf
    • https://value.ae/userfiles/file/lozajufugujolobo.pdf
    • http://shipsupply.ru/userfiles/files/zipadoboxikutasafi.pdf
    • http://idealhca.com/admin/images/file/jaweloso.pdf
    • http://thegioimercedes.com/upload/files/mulamefude.pdf
    • https://toocapen.com/files/67196535985.pdf
    • https://jamuiboe.com/webroot/upload_media/gadibigasotot.pdf
    • http://myagreement.com/UserFiles/file/12302244788.pdf
    • http://wingmanresearch.com/userfiles/files/13855300943.pdf
    • http://muabannhagiare.net/images/uploads/files/zejoru.pdf
    • http://jingluo.net/uploadfiles/files/37738315657.pdf
    • http://hitmet.slektenkaas.com/bilder/file/32628561071.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gta+vice+city+download+for+windows+7+32+bit+free
    • 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_off0000dc24.bin
846521da0305e5531f2210e1ef61ab4a9f2b05ec677bac689ee170c8db78ad15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 11256 bytes
font_01_sfnt_off0000f6f0.bin
ef2ade6e1aac6500f796bf99e80aedd3e71e8d60610d142ff93379bcc47467b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 16180 bytes
font_02_sfnt_off00012095.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 16792 bytes

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