Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c94426de87be7b…

MALICIOUS

PDF

72.5 KB Created: 2021-09-11 19:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d888d68c9b0f481a7d3fd924bfbcdc7 SHA-1: afbc90d463369b8553fbf9f0d1769c323e141cd6 SHA-256: 93c94426de87be7b7fab59fa8e29b259581ed4f66e22a07131db6aa9fef8e030
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, including one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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://chcial.ru/uplcv?utm_term=malayalam+wedding+songs+mp3+free+download PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02a13a4cf---17554411441.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/bedonuniforaxipigesakeg.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/dovegumalu.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/wapitak.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc05ed9d6e---xobamomiburuwinazupe.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/modukipalomaxemibudala.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/jazaliniru.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/76670267096.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///54499438093.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/66447485047.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/denawiwuxiwelezipuw.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/68098226286.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/jamabute.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/13345998604.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/83378610066.pdfIn PDF document text
    • https://maisonforville.be/documents/file/76772565865.pdfIn PDF document text
    • http://webursitet.org/Files/file/munujazapogumusiwiloxum.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/zifazugexofot.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/teditidimereke.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/dixavuko.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/batotivunalafilubik.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/75550819358.pdfIn PDF document text
    • http://brlairport.com/images/file/nizopedebuzexozolo.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/zapixulukekowixufunokezef.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/maxodokedupa.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_off0000b9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E5 11108 bytes
SHA-256: 0fa921e14c5712b3fa9add022c2557213bd412d89c9fbfb124948ddce855df75
font_01_sfnt_off0000d39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39C 15788 bytes
SHA-256: 10f874bdeafb555fdd2e07c7ccce149fcdd0449d51b7c9506dc098cc5bd3699d
font_02_sfnt_off0000fbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1