Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2172beafbceb4f…

MALICIOUS

PDF

72.7 KB Created: 2021-10-03 00:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7155e9b543c3a649ae2e5d61c81b6397 SHA-1: 6187deae71ed94a0888c28366e0f653717b54365 SHA-256: 6a2172beafbceb4fec47288cbb0bef106b2784d06bc4b72d3cf3b84136e4af2e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded URLs, many of which point to disposable domains and are used in a link farm configuration. This suggests the primary purpose is to direct users to external sites, potentially for SEO spam or to host further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=best+full+back+stretches
    • https://florissantdesign.nl/docs/Image/file/43783450562.pdf
    • http://infrabud.eu/fckpliki/file/16350076501.pdf
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/64776796593.pdf
    • http://amadpich.com/userfiles/file/zomepawisonexokejem.pdf
    • http://leebyunghun.kr/new/upload/board/files/53264057291.pdf
    • http://gandolfiarchitetti.com/userfiles/files/28454754080.pdf
    • http://epoxidice.ro/mm/file/pikigurezomevesebu.pdf
    • http://coolscape.info/images/files/55190295229.pdf
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/dikadafanad.pdf
    • http://ajitcoatings.com/uploads/85968263474.pdf
    • http://dom-2000.ru/ckfinder/userfiles/files/dodemuwewev.pdf
    • http://nhatnamvina.vn/rich_editor/file/13674648694.pdf
    • https://dentalrud.com/userfiles/file/ripatuwubupilusamulek.pdf
    • http://creptiles.dk/userfiles/file/kasugenevipumigitun.pdf
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/juzetamivuzubuludetewijek.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471475299d5---991393292.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614bce66088e3---folipuvufixijafuf.pdf
    • https://gtijsr.com/userfiles/file/pirivipeko.pdf
    • http://seghers.kr/data/editor/file/1333352750614e3e1aa8d02.pdf
    • http://soncongnghiepjotun.com/media/ftp/file/nesowuzikagazejewa.pdf
    • http://biirbeh.mn/images/content/file/kabogetakegizefuk.pdf
    • https://xylemleads.com/userfiles/file/71564386458.pdf
    • http://modamoda.nl/uploads/pic_lib/file/zedefevaloj.pdf
    • http://nt-module.ru/ckfinder/userfiles/files/megepepiviludim.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_off0000b534.bin
33e0c8662fe3c5293bcb99510fa988db10512d3d4a36aa308efb6d4303d9d1c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB534 18900 bytes
font_01_sfnt_off0000e4b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 16792 bytes
font_02_sfnt_off0000fccd.bin
b141b8c9d2fe9509bd7d3e0af710c8012d608d3f3f8f984a001d88b5afc9ccbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 10500 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.