Malicious PDF — malware analysis report

Static analysis result for SHA-256 c319aaefca9f0383…

MALICIOUS

PDF

78.4 KB Created: 2021-09-23 19:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a45797d5f9c683a19706c166f4b64abd SHA-1: cf39f128cffa102eeee915745c66b72dddeb8fef SHA-256: c319aaefca9f03838bfffec0d350decb138d1c7e402311d4c514e1d1db50e8dd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=video+downloader+kissanime PDF link annotation
    • https://globaldreamindia.com/webcms/file/vufapawafakafamaba.pdfIn PDF document text
    • https://mollis.rs/files/51859339293.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/95927839775.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/ribipon.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/bitedepabepivoboponog.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/wenoxewologevaxesitizulus.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/62389962891.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/favul.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/bedaku.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9f4acfb88e568e45bfd74d311ba1c189/lofidu.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/10956099725.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/jilawusojez.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfed51ac74---momaworapiwiferavugufu.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/49623866849.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/kikatibewabanumaxidelepib.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/xojigokumeduseliseko.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/nerotibetaxowerukosub.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/16379806746.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/72408638280.pdfIn PDF document text
    • https://resicolor.com/upload/files/13566522421.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/24751893171.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/kojojejefivunejolo.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_off0000ce9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 17588 bytes
SHA-256: 285ef0ba24ca1988488284394f4d9f2493039962e70bd2e37a41bbb40cdac3ba
font_02_sfnt_off000113fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 10456 bytes
SHA-256: 364d97f1675a7b5888b64b265bd7343a76fcab9a3208f2f12b9412e690610557

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