Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1bfb6df62964a8…

MALICIOUS

PDF

72.8 KB Created: 2021-09-21 00:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 005a77f3eb290ececfca8a4e895b1b4e SHA-1: 3b043fa548284914638aa04b87fd02e5c4d69a3c SHA-256: ac1bfb6df62964a8333a2dcf7062838b744213d66483d773d815b7d0690662a6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) and the nature of the links point towards a spearphishing attachment (T1566.001) used to deliver a payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=download+game+kamen+rider+kabuto+for+android PDF link annotation
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161319252badcf---zezojatuvebovuposepejak.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/xumonejeganot.pdfIn PDF document text
    • http://balalajka.nu/media/17657405482.pdfIn PDF document text
    • http://taociren.com/upload/file/210908212307587626do1t6lzncgit.pdfIn PDF document text
    • http://prosquash.by/data/kulibepefudeko.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/66575789101.pdfIn PDF document text
    • https://web-idea.ro/app/webroot/files/userfiles/files/zolawabefekefugixetatixes.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/maxuzogawifosiwolifudem.pdfIn PDF document text
    • http://mcutech.net/files/womubavowot.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/mumikago.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/13963981989.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/56406216033.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/nodizapujazimemimad.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/89288977820.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/lodezater.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/75403204675.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/rijufawe.pdfIn PDF document text
    • http://mutitar.com/user_img/files/bomesadefetunuj.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/25817703423.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/labebovibunabisufebujisip.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/9974334519.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/63dd298478947aa80177940e4fc674a5/tasugulu.pdfIn PDF document text
    • 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_off0000b739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF50 10948 bytes
SHA-256: 87fb2194d061a4c019d3f5ae15eb9609ac09fc10bfaac6dbdefa26ccde0fb483
font_02_sfnt_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 17592 bytes
SHA-256: 50c211c83ba24a3147fb4c9317028eb6da8112b98af173b190a06f9b293a3ac0

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