Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb71da1b922e9679…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 14:20:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c721050d9d63c9b7354180c617696afa SHA-1: 1727589720797d8bb8f5eaf8aff98a2e11877d35 SHA-256: fb71da1b922e9679ddf006b086f49800b7463e8a07172f50396eff774435b2ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://philabc.ru/uplcv?utm_term=play+store+app+download PDF link annotation
    • http://www.depomatrial.com/file/2990391356.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/69365837051.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a909d0c5e---60123511923.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/95806729965.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210908_9449EEDE8B25025B.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/pusenavapokiduzinemapigo.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/7425756466.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/genofagesosi.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15715601558.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/328952856.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/57575923976.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///vepewolaripeguwade.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/4079645888.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/jakisaxoge.pdfIn PDF document text
    • http://e-hematologica.com/users/file/33692886195.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/75543609509.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/gepizejasole.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/47300310458.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/sazajeramaxewog.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021090412351373499.pdfIn PDF document text
    • http://showpelec.com/data/file/20210904_082742_492.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/65828305257.pdfIn PDF document text
    • http://redagowanieprac.net/Upload/file/zonebojobonedijizuvivo.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/77332095905.pdfIn PDF document text
    • 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_off0000b1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 17624 bytes
SHA-256: 7f507bf2c014efd1b356544e209af294591411429511c230abcec1a9ab4bdb8a
font_01_sfnt_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 10492 bytes
SHA-256: 93479bc9e8324be2775d32db303a27f5b008dad09e74b37d1ce0b7d4ad53bce6
font_02_sfnt_off0000f733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1