Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ceac4dc95a03056…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 10:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 32ea0f61da1b7425574fd0efd6688a4e SHA-1: 8cbd207584100ec5b042f1c301da61072cf6dec7 SHA-256: 8ceac4dc95a03056a22e1644d93e157c7a3074a8afd958e8520a49c47858c0bc
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript which is a common technique for malicious PDFs to execute actions. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links on disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161312c1877dd4---puwovagowe.pdf In PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/66099348092.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/dewafajekiras.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/levapewasefumaduwibogidi.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/tijuxuvopijefawajosepef.pdfIn PDF document text
    • http://flirdining.com/uploads/files/5186260727.pdfIn PDF document text
    • https://dalba.net/other_files/File/lowepudotedudeg.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/xezobebadorizer.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/86612953609.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/wutoxi.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/98416401320.pdfIn PDF document text
    • http://alptw.com/images/files/vaxutedusuvezowotasuminor.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/48213942193.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130145ba046d---gireniziwoxufepuded.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-04/7aa71f1818d7b0870d67729af6b078cd.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/duzamazivu.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/20678038577.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/87536793887.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210911181739.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/59689820657.pdfIn PDF document text
    • http://tid.vn/upload/files/85956746891.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/92135026396.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/27102892224.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/69470479259.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/73556461331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=hairstyles+for+oval+faces+with+glassesPDF 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_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 17364 bytes
SHA-256: ba1d304bcbef6b560dc272892cf3112f99cd7a4b42f47be1bb74a3f59a3d6db3
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 10768 bytes
SHA-256: c81ec8561a189f33fb62df5bb739c496b5acc9eb6be11c1baa5f2d113c4612f6