Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f0c7a4a1699ce2…

MALICIOUS

PDF

88.4 KB Created: 2021-09-18 02:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee2f983f26926639803686b31af1c16e SHA-1: 3bd0cc89ac478e9d792c86d6749f211f22272606 SHA-256: 09f0c7a4a1699ce2d357dcb90a2facfc0eb0d116d895553497cbdf7858d38d71
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is designed to host many links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=android+linguaggio+di+programmazione PDF link annotation
    • http://www.azurwelcomeservices.com/userfiles/file/ridojabiv.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/93313232452.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/7906902080.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/53963278892.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/15505298520.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/jurukimamaxexesimasafot.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/10570231719.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/dupokolebiw.pdfIn PDF document text
    • http://rs-entp.com/upload/file/dapovewowidiv.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613c492dbee62---ketobajemadotumumifojiz.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/28381615774.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/33977877665.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/lilonabikajabesusasenew.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/mezelafobatabotefavimex.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/9254308019.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/77461655430.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/daxujuxi.pdfIn PDF document text
    • https://clickbox.ro/images/file/zusoveziw.pdfIn PDF document text
    • http://methese.com/upload/files/8267553050.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/sebobeporupi.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/kizulikafaf.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/zejiwaxofiwaketo.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/32361285846.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/sillkeak8gm56u9vda1v9imav9/89486713342.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/25141905890.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_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1A 10612 bytes
SHA-256: 10b3de9b67f4597fadbc753c3258c939200289c494a8d3e0b6492c71f21d39a8
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 18044 bytes
SHA-256: 6ef220e5251eff4e6d0e777a36bbb6c34b5d58348fff72342ce200258c156e30