Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd233846fb56e2f…

MALICIOUS

PDF

67.2 KB Created: 2021-10-02 13:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 04e7ac71a4465d8505cb9c76b125f5f1 SHA-1: 22db9a3b8f7aae242a637d26f7f5fee9cbf19a89 SHA-256: 4cd233846fb56e2faa7d3dbd876f7314e67b1a1bd1a69b3730e6d78f42e63f48
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. ML classification and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the numerous URLs found within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://tungalag.mn/userfiles/files/zefepipuxonisa.pdf In PDF document text
    • https://tessuno.com/upload/files/614ad42d28b91.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7c04dd0dc---34896018178.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/xawozuxapebexomaz.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/58501701755.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/9234901558.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d09d631d17---noromezatomaserifexikud.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/72838689398.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/redojedanurodeges.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/20745077396.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/13000994262.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/gufekoziwozetaw.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/gowamupiwubokazevewonaji.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/rodalopilovitizob.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/92126963012.pdfIn PDF document text
    • https://812423.situshoki1.com/contents/files/kimuxub.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/witikobemujusejarelodepi.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/zetaxegu.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/keguwowokitibevijikova.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/kananoruzeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=paddy+cultivation+in+india+pdfPDF link annotation
    • 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_off0000ab16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB16 10496 bytes
SHA-256: 28d5d9fc89e61c3bf5b3d6452c4509fd96d8ab9ffe9a01371c6ac4f5baf182dd
font_01_sfnt_off0000c30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 14540 bytes
SHA-256: 8f4cf564633fe38a65dc4982266bd4f2772bc413de96cf4fc5ed0f2b47c26186

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