Malicious PDF — malware analysis report

Static analysis result for SHA-256 f861ac7b1f869f31…

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 11:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0803bfa1b4df16b5f820b1135fb4ae67 SHA-1: 98c34e693891a50c3982194a078f585d2c504b34 SHA-256: f861ac7b1f869f3152f87a7dd3533bfe3e589fe475842f3886de2c63b0984fa2
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. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://le-bouquet.be/userfiles/files/mazivepew.pdf In PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/tulujew.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/92724264258.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/11889954313.pdfIn PDF document text
    • http://trivio.it/userfiles/files/kupeninuko.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210905_235555_157.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/73170121580.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/61828403938.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/22413298705.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9term21ohthpn8j5s71mt14mf0/bagenevijologivuropagale.pdfIn PDF document text
    • http://vhz.cz/user-files/fenadadidap.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/piwabujiposesex.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161318ebac4dd5---newiw.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/72267481198.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/2233745357.pdfIn PDF document text
    • http://rentaruedas.com/files/others/94195125360.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/17962735712.pdfIn PDF document text
    • https://deepex.hu/hirek/files/33594905530.pdfIn PDF document text
    • http://yuha.be/_files/file/sutezazakug.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/45953462297.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210902095709-20955435948.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/kevitijojajeb.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/85169727313.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/8147368616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=short+codes+for+androidPDF 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_off0000c356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC356 16896 bytes
SHA-256: 78e7e5b089092ee480c93411c08978e6148142f7be45a7843455198f082559ac
font_01_sfnt_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 10600 bytes
SHA-256: 3cb764f026274edb67193a2c80457e42db2d948a147a142cf364342db6008d2e

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