Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a81f08c3669e5b…

MALICIOUS

PDF

79.3 KB Created: 2021-10-09 15:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4e0575d90b86f81b3862b4f3cfba986a SHA-1: ff4f0aaea7c4d3464ff535d715ece83526fc0d37 SHA-256: f0a81f08c3669e5b6a6ac034547445d0c6cf3520e192854264bf966352851860
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://woodfur.in/userfiles/file/10796479564.pdf In PDF document text
    • http://hk-bbc.com/upload/file/kuzogepapabexidafimu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614cfc49f07bf---zibadaxelopezerafesotet.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/kokudibiboniweze.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/22845676509.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/sobawesupukenegenawolalin.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/59943681606.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/96063080222.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/28485096752.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/88701644140.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/23729896592.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/titefatolemowonoda.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/52531662103.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210914_06ACC4E3C093286A.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/52914180018.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/76240514699.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/dujimasovolinidinivux.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/gexunupajet.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/52046692052.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/16209051802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lexical+approach+definitionPDF 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_off0000d471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD471 16708 bytes
SHA-256: b82f6970b73c4c657b7435f70dd7e72a654713b4c469f7b51c3bb9021e8801bb
font_01_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 10608 bytes
SHA-256: 174b221368531c23c5c868b0579b30f2931f1672a39ece2b6d97c8db3ea52b35

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