Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8708996780dd965…

MALICIOUS

PDF

82.1 KB Created: 2021-10-10 13:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 58dfd018b0cfe94656d3fcb5900b8c52 SHA-1: e528fdf59d2e796016e16b323decf103e980124f SHA-256: f8708996780dd965317e5f3e1009810d174e84269cde05c6c11e13dcdac06494
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the linked websites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://vattuxaydunghl.com/userfiles/file/rilovufaneruvixulubu.pdf In PDF document text
    • http://stphilomenaonline.org/userfiles/file/63251705566.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/voxavi.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/rodof.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/tikofonemukane.pdfIn PDF document text
    • http://iwort.de/userfiles/file/74123374048.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/42342921794.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/vijazuwuwinuxara.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/95085028366.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/75616580983.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/zoxivojewikemudomipewuji.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/rejutuximagisipifupafa.pdfIn PDF document text
    • https://totounited.com/contents/files/savefanuvojexapegida.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/34802797150.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0bfe6eaa0---27103596174.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/tafezujol.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/549074703.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/sarap.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/89189559335.pdfIn PDF document text
    • http://seed-hongkong.com/uploads/file/25311368458.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/jnv0p5cpdvst4vm6rqm2o7b5c1/46486697899.pdfIn PDF document text
    • https://cargotavio.ru/files/file/monaravo.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/85916129080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=amplitude+frequency+and+phase+modulationPDF 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_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 11224 bytes
SHA-256: c2447fbc86fa8dff35c1b4a08b6264480d7023890858d9b23d0d5aa5eefd4632
font_01_sfnt_off0000f220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 18564 bytes
SHA-256: 61c0c7c05c6aef5fa87773114ec7e80ed63780accb67ceba5baffcbcd138ecb7

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