Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac42789487ebb21e…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 21:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9193ff5f30bb6b4deab0b2421b77e3d2 SHA-1: 8814539a733305b715ca7d35fe0747575f526063 SHA-256: ac42789487ebb21ee112446bbf5ba8d931e5591f167ca5d8a98394bbe682bdb9
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and a heuristic firing for a 'download button' lure, suggesting an attempt to trick the user into downloading a file. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns are indicative of a malicious document designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hfbee.tw/upload/ckfinder_temp/files/20210921204525.pdf In PDF document text
    • http://le-nora.com/userfiles/file/vulave.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/vedisosupaxipaduxajoginut.pdfIn PDF document text
    • https://edex.co/userfiles/files/losutafenupurokigatekapo.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/37152991002.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/dabemubigaradovu.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/fufunazuwus.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210913165855.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/puvopolixunexukawe.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36028042268.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/92265037946.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/22434137360.pdfIn PDF document text
    • https://123natura.com/stockages/files/vizurulekapakul.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/64739055353.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161342d864728d---69109811190.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/33272704458.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/kavakerifi.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/35122363311.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/zakonedovu.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/49544868093.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/dmto0808f1bjoaene63b5q37v1/5420851129.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/tivanewatidem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=snaptube+apk+download+updated+versionPDF 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_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 19208 bytes
SHA-256: 28617f562d3b26ac9d8deace3b0dc5763ef4d4e67bb310b68d07e986731171ac
font_01_sfnt_off0001110b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 10944 bytes
SHA-256: f86a8b9566587a11c4d3ea265a35ba1463dcbd3b77f9e10a28df546c6205ea5f
font_02_sfnt_off00012a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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