Malicious PDF — malware analysis report

Static analysis result for SHA-256 410c556e017ffd81…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 12:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8a54e26f9299f87b75a3e707c29e2bd SHA-1: d462da640de184480b703300a6f7b5dd8d20aaa2 SHA-256: 410c556e017ffd81816d7e851d07c46ab709502b150e8a3a6b6307a885474068
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to PDF files hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://assushop.com/userfiles/assushop.com/file/xamizutaxebikazed.pdf In PDF document text
    • http://italy-ex.com/images/blog/file/72226129230.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/35426946885.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/64742147914.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c023248fe4---74151650968.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/pobone.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/35020787578.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/96745508099.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/40593312404.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d0ae6851---dogijewadu.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/4966600619.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/kuwosakejifixipatege.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/25747857414.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/vukememogi.pdfIn PDF document text
    • http://haki.vn/uploads/files/91525849707.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/piketipuza.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/43016900575.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/xuwiretirok.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/40705332042.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/20639971916.pdfIn PDF document text
    • http://greenbrier101.com/userimages/zofexu.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/femiloxavajabewabu.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/xawizanukufokalifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=govpn+premium+apkPDF 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_off0000d02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 10400 bytes
SHA-256: 29d30e3ac93f0a73df475b47bb0189c47c5580cae8d9cf398006b804070d9650
font_02_sfnt_off0000ffca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 17304 bytes
SHA-256: 4c9df2bd25bddc193e881feac322ab0a58051b356b9d234d434319b037173b34