Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfb7c5bc3761ef2…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 23:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 37849f422bcb3af08a699cf5166f0d07 SHA-1: 1248fff4b62b7d06803984b9e428c039630b05a2 SHA-256: cbfb7c5bc3761ef28e1c5e6515895cebb76171cf0c3cc12668586e7cc6543f36
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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://medvor.ru/uplcv?utm_term=avatar+the+last+airbender+online+stream+free PDF link annotation
    • http://everbeenmagnet.com/js/upfiles/files/10549252658.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/58626975449.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/95447810604.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/vuzotofesidaluvupevata.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/47303756487.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/3411725847.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/53680539798.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/wadobezesazonebuzumaga.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/karapadofafugelo.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/76784493831.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/29866957035.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7f580dc60683e666086f2a0d1dc2513b/zinezuripefoturatemudilu.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/wowapeberijuwefebid.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/72440760056.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/28712913061.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/dapidukezoladinigiko.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/5733761979.pdfIn PDF document text
    • https://tsolisp.com/files/file/midopusavizuxor.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1f35c0c6---mepozawuzunovadapaxanimik.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/43040753577.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/muxaromewobatabizuw.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_off0000aeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEAA 10808 bytes
SHA-256: cbf683a76272ae90f91082389b32c6dd80ce7d6c32fd0c86eedfd8f282fec89b
font_01_sfnt_off0000c765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC765 14568 bytes
SHA-256: b5b811df84cb90ded2d24acb06423d06786c67ba456a9e677be55d564f4ed2a6
font_02_sfnt_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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