Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93143ff2b915ee7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 23:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a5e4f1469219d546534d2981b85032b SHA-1: f62036f14e7a8f1dcd09c1d3bb88bea3d1e28a58 SHA-256: f93143ff2b915ee7fb2b40508f4e26831b1156d401218f93801b12d5a110e271
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect the user. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' strongly suggests the document is designed to trick the user into downloading a password-protected archive, likely to conceal a malicious payload from gateway security. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://anpharma.net/upload/files/zedulis.pdf In PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc2132992d---45739457154.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/vufajedofelukoxale.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/mokunaxikaruraripu.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/funojarar.pdfIn PDF document text
    • http://wohntraumgmbh.at/95932218508.pdfIn PDF document text
    • https://langumeistras.lt/i/File/83754022085.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/pozimajururefudeme.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/katerub.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/38401320084.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/22976299994.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/jawusedemaroxonibibivimu.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/bujasarumadi.pdfIn PDF document text
    • https://atputasbazes.lv/images/userfiles/files/69682139294.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/noredizo.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/85418756497.pdfIn PDF document text
    • https://edgecs.com/documents/54641000914.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/pitasexanu.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/sunoredunexutitobugifeduz.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/81061031914.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/93174930605.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c91f90e08---67167067885.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/96938258897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ios+file+browserPDF 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_off0000de54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE54 10020 bytes
SHA-256: 0575f1b77f6638815ecc370842de1cb507a0046b175173be1e1910b75fced2d4
font_01_sfnt_off0000f4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 17700 bytes
SHA-256: 4dc55a808fa2293b1800b31db8d163fe95131adbbb3a65e33cbc8c1e77908e2d