Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3863d7dbf70f79…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 22:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb7ed43d7720d1e7fdf7106b704a9132 SHA-1: f45274aa453c486dc5060224b060f0e80dd68b85 SHA-256: cf3863d7dbf70f79b4ab729720610cd5ce760ec9132aeb65d02c1be07486e5ec
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm nature suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 4

  • 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.
  • 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://ozdesignhouse.com/app/webroot/uploads/files/95967907763.pdf In PDF document text
    • https://comillaspostgrado.es/userfiles/file/sekosokipu.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/naxemazavefoso.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/nakiwirewoxenuretokab.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/mipugisadoje.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/purexexoto.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/depezomebozasag.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/kevaluwib.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/56865146031.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/nopatiwej.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/26613629590.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/vidapele.pdfIn PDF document text
    • http://kisito.com/userfiles/file/rilaka.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/51043143140.pdfIn PDF document text
    • http://okvin.org/userfiles/file/75620732116.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/71061606806.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f550f3a14---gazuwanukuxojos.pdfIn PDF document text
    • http://flathead.herosuite.com/userfiles/file/timafowevela.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/25496356643.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/pirodogorijodivutuzu.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/9730603759.pdfIn PDF document text
    • http://marine-inox.com/i/File/39678373444.pdfIn PDF document text
    • http://hmed.vn/upload/files/82704124754.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/66615539002.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/58506465055.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/88679881287.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161462a91d860b---96529431477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=twilight+princess+manga+pdfPDF 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_off0000b36a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36A 16040 bytes
SHA-256: 5ffef699086e4401c594c7b23dea592bc69723bc48aa2e579762e722e76c16f3
font_01_sfnt_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 10996 bytes
SHA-256: 73b246b8befb7f3e8f74da2f2bee26046342f3378cd87743aae3766a82a52dae

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