Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc29b90685faf34…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 00:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b28a774d90b070ced8e964f39621cd0e SHA-1: 8a266121fb22dca4fc687a4dd7cb0037405dd656 SHA-256: 9bc29b90685faf3431b47d228858cae3426b4fb392089fa1f0b795309d7a424f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

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://cructi.ru/uplcv?utm_term=root+android+pie PDF link annotation
    • http://pillshop.ru/uimg/files/kutogevarit.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/1815261813.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/22970736168.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/28439407683.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/49722043685.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/60361552884.pdfIn PDF document text
    • http://vodnik48.ru/content/file/99544814647.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/33600609149.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/luwologemujotaneke.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/kofaregetituwimura.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109171349057745.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-1/20210901154934101996.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/76073134471.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/pixamu.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/vaxezorazikozijimosede.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/76566536218.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/77309369669.pdfIn PDF document text
    • http://popmetre.com/news/files/fipamozotajede.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/81968492552.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/56940921228.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/78989725610.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cf5c5d391---jowolozexu.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_off0000aff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80B 10216 bytes
SHA-256: bba7aa2b60027841aaaa2a7957ffcfac3b9132720c231e30e741e5e3c4bbc627
font_02_sfnt_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 15512 bytes
SHA-256: 6369810e91b24aa50e53c90e76ddbc500cf141dffba08da942102ddc9d9471f9

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