Malicious PDF — malware analysis report

Static analysis result for SHA-256 6309653135762a86…

MALICIOUS

PDF

82.9 KB Created: 2021-09-16 19:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 94ab48495041b935ff52c6ebcc19e7c4 SHA-1: bf744007547e57ffa52cbf74a4b73225b52eabec SHA-256: 6309653135762a8648a9c01e5b58be95fa17b7377d6282faf4f9ef204b6ba4a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious workflow, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=aksar+2+download+full+movie PDF link annotation
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ubb3mh43q6ckec3omrfjnbr160/43212384700.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210907_24080B4B87D30037.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/tusiwobi.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/61073981001.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/zofoweturazejanotifejab.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/xomosojasulefotugukufeko.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/pedonozomap.pdfIn PDF document text
    • https://freeunlock.com/uploads/file/16759692851.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/xadara.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/82001493512.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/defesitasideri.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/21168010730.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/75138281307.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/tusebok.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f32a28c47a---11310119056.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/27611503885.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/fujejegopal.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/93488067741.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/95251473338.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/bebulusadelu.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/96948415264.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_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 10860 bytes
SHA-256: 742779b3b3a0fec506e5aae908a890d2099b78fead75bdd9417997b95b6b4f58
font_01_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 17256 bytes
SHA-256: 8059c2118cca6f0008ad502cb34a67eacf49d73bfd707c4395af148ab30bccbf
font_02_sfnt_off0001269e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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