Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28acdff6a889ee2…

MALICIOUS

PDF

70.6 KB Created: 2021-09-30 12:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c67349f565396a95f405c9cb560cfb74 SHA-1: b5a32459969cef5be8b4669c66d62aab4bb55f90 SHA-256: b28acdff6a889ee22389022bad0e0d1167a20050ab304db7f6a3aa38b4a50474
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed as a link farm, likely to distribute malicious content or phish users. The embedded JavaScript is likely responsible for initiating the malicious activity, such as redirecting the user to one of the listed unknown URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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.
  • 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://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f209c9636c---wedovaserejojed.pdf In PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/rovivadetanemeribix.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/44869427330.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/duxovuboxuxil.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/lisesebelajit.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/vupodif.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/60625467388.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/53101272139.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/noduteladivixug.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/24397862505.pdfIn PDF document text
    • https://wonkingchina.com/d/files/watulajomijazovufidubi.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/foxeretejulozuxawesuvobu.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/femawesosetoguli.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/xaxemapopib.pdfIn PDF document text
    • http://gibisch.com/files/files/19471605327.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/13485832219.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/54286665314.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/gudodowububinonego.pdfIn PDF document text
    • http://gameadvisers.com/js/new/fckeditor/userfiles/file/jemozenaxovovopa.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/siwesisawuroniwi.pdfIn PDF document text
    • http://ashioke.com/images/library/File/19426481612.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210906_021104.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/13560800967.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/maropo.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/65560680163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=redmi+note+8a+battery+mahPDF 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_off0000b0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EE 16584 bytes
SHA-256: 31c16b378eae2ae6ef9926145623bea03cf8a471a632945377f8e9a7cf3abc42
font_02_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 10808 bytes
SHA-256: 1c3b7030f4bf1b8993dd9cee8e5701034224def7eeb57129a47d9217685d3a83