Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd9fc6aa0b92f1f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-22 21:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4afd9fac557feaac499ace073f7bcd81 SHA-1: 32eb8ebcb2600739b1a6cff349e1cdfa9e5d3e8f SHA-256: ebd9fc6aa0b92f1f90a298a1d49abc563abeae2be8ca12d05af7ebfa520d3acf
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 point to disposable hosting. 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 PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://pixomot.ru/uplcv?utm_term=valorant+dragon+bundle PDF link annotation
    • https://mosallaesf.ir/uploads/ck/files/laloninewatumegev.pdfIn PDF document text
    • http://school15-tyumen.ru/f/58724962484.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/12082906760.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/tetelora.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/tewaxobilimiturik.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///94092348107.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/71791881228.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/mikezipa.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/99880537872.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/pasuvuxavemino.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210917220346.pdfIn PDF document text
    • http://kleiberit.ru/files/file/2957017317.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210915160752_a3kmae.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/befarumuz.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/24211240993.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/24749552391.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/85748328662.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/73465479850.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/vusipozitibana.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/83014124905.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149e49c773d6---putino.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/70840929248.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_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 17868 bytes
SHA-256: bcb7dccbefb105980dbe15fa3167d6792352f378e35d6805b3b76230263a40d2
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 10372 bytes
SHA-256: c5e026cc214b6645c471f7891ba95c91b82dca511e12487e9946741dd19bebec
font_02_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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