Malicious PDF — malware analysis report

Static analysis result for SHA-256 4004bb0ac113c142…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 22:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bf798558a3dd0e0a7ee9bedfd7c887e SHA-1: a8cddee46c63c20a8dc1c596411c52fe03e12e46 SHA-256: 4004bb0ac113c142917ac7063a59c0bacd9877721d89e702acb47f24c2b8ecd2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious actions within PDFs. The JavaScript likely facilitates redirection to external URLs, as indicated by the PDF_URI heuristic and the presence of multiple URLs, one of which is associated with a link farm. The primary malicious URL identified is http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/begosegapudamaforibudabib.pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://smarttechsolutionukltd.com/uploaded_files/userfiles/files/begosegapudamaforibudabib.pdf In PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/13466659014.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/26377910566.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/lanepave.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/tosegadajakavekunitubejid.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/48261347960.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/80744616079.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/mizikoxediz.pdfIn PDF document text
    • http://kezheng.net/Upload/file/defokavarawixinigijikere.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/libavup.pdfIn PDF document text
    • http://carbonelite.ru/file/kafoxixuruzaxuwapivadoz.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/gotowesevaxa.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/xixurato.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/noperopatujidopaz.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/37254300828.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/pusidi.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/45540376420.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/dulik.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/tifuwer.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/sexuxaba.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/wixowekibojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+mozilla+for+android+phonePDF 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_off0000d72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72A 17908 bytes
SHA-256: 2615272114efa4ac8db088e64e2b6c9ef59b561c49740dc457074d13dd17fa33
font_01_sfnt_off00010576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10576 10644 bytes
SHA-256: 85ba99e8f25468bbd1d30f880dded41ebaaaae259239ff625868c352cb193387
font_02_sfnt_off00011d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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