Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c860ffe27c9c9d7…

MALICIOUS

PDF

93.5 KB Created: 2021-09-16 02:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 415c9b8be986eadb33bd1c42dc00165f SHA-1: 3cb7e3c80d17478584355d503b6ece4b11cb8b57 SHA-256: 5c860ffe27c9c9d71b72290e3cbd6cf73f136e9ad0fc7f916c44678835b6350b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution document. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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
  • 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://synerhu.ru/uplcv?utm_term=install+nova+launcher
    • http://mitsubishilongbien.vn/images/ckeditor/files/xapiwumasanima.pdf
    • http://antasboru.com/guvennet/resimlerfiles/76629997153.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135862dcd7bb---86879161706.pdf
    • https://gkscam.com/userfiles/file/55806834191.pdf
    • http://sapientgenerator.ru/files/userfiles/files/kefilutodup.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/nonobuzokesi.pdf
    • http://ztkammer.at/uploads/file/subomixekulu.pdf
    • http://netart.hu/userfiles/file/mabikokofenujalugiw.pdf
    • https://implantsdentairesdesmoulins.com/upload/editor/file/88031857975.pdf
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/46154480629.pdf
    • http://bsa.by/ckfinder/userfiles/files/bopipariluv.pdf
    • https://ladangmimpi.com/contents/files/14957437647.pdf
    • http://spl-designs.com/ckfinder/userfiles/files/30406240850.pdf
    • https://ashleymongolia.mn/uploads/files/24870152631.pdf
    • http://hftyby.com/upload_fck/file/2021-9-8/20210908080530188807.pdf
    • http://hotelborgodeipoeti.com/userfiles/files/25163926678.pdf
    • https://tw-itemaos.com/ckfinder/userfiles/files/xuwawamufowevogemagofa.pdf
    • https://greenfuturevietnam.com/Upload/files/95935439904.pdf
    • http://abworder.com/uploads/files/88275041142.pdf
    • http://hajnysport.cz/FCK_userfiles/file/peluwuwunodu.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161396e26beb70---batidakos.pdf
    • http://ecilingirler.com/resimler/files/ronebakeradododajale.pdf
    • http://maility.pl/_ADRESuserfiles/file/644807989.pdf
    • http://retailpark.bg/uploads/wysiwyg/files/bogejeli.pdf
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/zikenameromufolijofos.pdf
    • https://nicklason.se/ckfinder/userfiles/files/wozarapowinirakupubet.pdf
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/81306389204.pdf
    • 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_off00010912.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10912 16792 bytes
font_01_sfnt_off00012124.bin
a13fb7a2a513e0788513127476807ff193c99ae796934e99a4f45ee2bd9fa9fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12124 18316 bytes
font_02_sfnt_off000150a1.bin
87a5b83e82383108c676a6e214580701a1a6474d877df19af8d90d7dc138fc4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150A1 10352 bytes

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