Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c870fb99cfa896…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 12:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cb171377529d0183136eb3054a691352 SHA-1: d626a6157f64cf702fb60625378c2957728d4182 SHA-256: d3c870fb99cfa896a3cb0aa052c510e8119df5a2a2728b1dda0710fa20a0592c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=booyah+app+old+version+download PDF link annotation
    • https://marikakozmetika.hu/editor_up/renowogunotov.pdfIn PDF document text
    • http://baove24h.info/upload/files/2917325112.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/jifivo.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/rutijatu.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/gazigerevedafesipineguv.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16142982eb342c---62208886012.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/lumirel.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/ginezupemulomoxoso.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/majotonepefarolidopot.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/24868842354.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/jazewidowonawepabuv.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/51328975275.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/ladulap.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210901060753.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/gokibixegatuniz.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/204369082.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/xiwejuborubuwusip.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202197718258023.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/39803106528.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/82924035459.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/40668378101.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613968122fb48---15906524.pdfIn PDF document text
    • https://asi-filter.pl/files/file/10856754830.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/wipokavixosaledip.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/52768190568.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/59083981009.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_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 10708 bytes
SHA-256: cac2f5a43175a10b5226530a223c3f0ae05bba5e616f6c6f79a184c43159446d
font_01_sfnt_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 18264 bytes
SHA-256: 6c2427aa8b83b39a48326a46d33402ec1cc79975ac08d21f14ecca540e917ba6
font_02_sfnt_off00012635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1