Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc9b7716a7a2939…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 14:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 865bf97bc0639a909a3f0d1e0ca7d218 SHA-1: e5d208b12a1c3aee7dd501fe2939c37a30f85b33 SHA-256: ffc9b7716a7a2939942ff4b2d877a43e809ebc8a3c2b89a964c3bddb84cf92c8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a high number of external URIs, many pointing to disposable domains, characteristic of a link farm used to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://malagi.pl/user-files/fck/file/22374817608.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338342340ca---pofoxobe.pdfIn PDF document text
    • https://oferta.lt/i/File/38345091792.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/luvubadepesazipeb.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/81299501974.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/juzobalagevisab.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/56711897827.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/nesavexiwexekof.pdfIn PDF document text
    • http://brushes.tfe-design.dk/userfiles/file/bapijetum.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/kazikemeni.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/pakevekoradobopixo.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/26abd945b7c87484da4e1baff94d158c/wesurib.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/29191326071.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/49005048288.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/gageluledolupafelubomixok.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/46697954000.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/562727275.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/wekitas.pdfIn PDF document text
    • http://maksimetall.ru/files/60610894762.pdfIn PDF document text
    • http://manu-transport.com/documents/file/89474083852.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/24581176144.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/kivuw.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/1497573206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=escape+plan+3+full+movie+onlinePDF 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_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 10764 bytes
SHA-256: 36726aa5ae932274c1343d1e68c4cfcd17ff7f1412edc744779b14e566d7d1e0
font_02_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 16776 bytes
SHA-256: 8b5524744272bbc1e53b66e3216413f967f4d4f5a5c46700eb3961b8eee39250

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