Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c296b1f974231cc…

MALICIOUS

PDF

88.5 KB Created: 2021-09-24 10:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee578557f537e1f0d16d9d9e4960a8ef SHA-1: 7f477f1330cc96ad767e5bead6639861caaaceda SHA-256: 0c296b1f974231cc8257b2af955db7714dd5c408b5979309e01fc644b5d28045
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 hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

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 https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/48672213493.pdf
    • https://cingenito.ca/upload/editor/file/4567186266.pdf
    • http://mariautonoleggiomarsala.it/userfiles/files/wivoxuwozinesonowi.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/54555484272.pdf
    • http://hycxchina.com/filespath/files/20210911171006.pdf
    • https://ikorti-iao.com/userfiles/files/78964097983.pdf
    • https://onsale.social-push.cc/data/fckeditor/files/rokesupoze.pdf
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24934664773.pdf
    • http://geomanteia.com/userfiles/files/21560507934.pdf
    • http://salman-group.com/userfiles/file/zemazog.pdf
    • http://cy2hand.com/userfiles/1683461519.pdf
    • https://girl0229960192.com/upload/users/files/metuxazobobazisev.pdf
    • http://adriennemason.com/assets/files/vorubajuguxizanafugize.pdf
    • https://databaze-zdarma.cz/userfiles/files/34762928654.pdf
    • http://bright-inter.com/file_media/file_image/file/suvazalodigonuk.pdf
    • https://wonwon.taipei/photo/file/mazirurulen.pdf
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/ginuxijagavisaxuvapuzudef.pdf
    • http://potlista.com/file/files/ruroxuxabuvewasowifu.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/jutifawevetigeduxuvo.pdf
    • http://ooexperience.be/assets/Image/files/naregotasamiturakipuze.pdf
    • https://menokatea.in/ckfinder/userfiles/files/1301614483.pdf
    • https://t2sc.me/userfiles/vobupesifod.pdf
    • http://surausa.com/uploads/files/9890979401.pdf
    • http://z-sinpro.com/upload/files/96188271330.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=practical+c+programming+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f08d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 16792 bytes
font_01_sfnt_off000108a4.bin
c6fb52fe6157f1adb6e303c041a5cc081e6dc63729e4c76d514c6480092a2ee0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A4 10664 bytes
font_02_sfnt_off000120c5.bin
aacf7052dea82dee6e1190ea972ed8f271c6f1fdc9bef22346c8683aa7eb01d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C5 19196 bytes

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