Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b0cf5261cade5f3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 09:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 429655069a1c707ef659c1e4cb627116 SHA-1: 8c113f2c76105179fc543e6d0d698beaeca10b42 SHA-256: 9b0cf5261cade5f30eb66a54d003db14a3b056bfc97fb3dd386b0207166ee6e1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. The presence of embedded JavaScript and a large number of external links, many pointing to PDF files on unknown domains, indicates a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be non-readable content, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://moveo-sport.pl/userfiles/file/nabaxavurozamedavo.pdf In PDF document text
    • https://lhorizon.ca/uploadHorizon/file/tebabip.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/36361324589.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/19879044532.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/bemeniveruwukukok.pdfIn PDF document text
    • https://castel.ro/userfiles/file/23128595786.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/7792780566.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/jomurigidaf.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/xikuwuzadijojudawe.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/zebup.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/68158138000.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/11100811101.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/nenegevonokofonubunizutuw.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/zisel.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/53263552886.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd96e67a56---97044611606.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/gowaw.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/loxizazilanitosim.pdfIn PDF document text
    • http://varvshistoriska.com/file/gafuzuxakatapexurura.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/70016271699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+folder+widgetPDF 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_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 10268 bytes
SHA-256: c777cdb2ac86439938983f4e114c535037689a7bcedbde3dd0d57f4c634409e5
font_01_sfnt_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 17992 bytes
SHA-256: 394b40959da4d9c07e9d5eb785ea1751431cc7b335f540e0743d0850286916d8
font_02_sfnt_off0001208b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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