Malicious PDF — malware analysis report

Static analysis result for SHA-256 712b59ba4a6758d0…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 02:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e560cd67d477d947f9e0e9b9df31759 SHA-1: 693d44956d028f6d7c28e0c0ec54897cd565f84a SHA-256: 712b59ba4a6758d02abc7c663b11ab3e88637d15c269f077c0055c1f911488e5
74 Risk Score

Malware Insights

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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 http://veoguidecostarica.com/ci/userfiles/files/13511317313.pdf
    • https://csp-pub.com/stockages/files/revisupasalijukenumur.pdf
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/32646003208.pdf
    • https://mallorcaboom.com/res/wysiwyg/file/13806905705.pdf
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/15335517935.pdf
    • http://afghansolar.com/userfiles/file/12948440662.pdf
    • http://vigen12.com/userfiles/file/morito.pdf
    • http://www.zywawiara.pl/pliki/8142857431.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8d74bfb7---7211838728.pdf
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/32760273589.pdf
    • http://kurumakaitori-one.com/js/upload/files/72336747617.pdf
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/24316857649.pdf
    • http://zezoalza.com/ckupload/files/50201171330.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134d60f0fd41---7121389029.pdf
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/40996895406.pdf
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/mufasojetel.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/18547827583.pdf
    • http://www.mostenpo.jp/userfiles/files/12243175548.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/lazaperapifulawoj.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/debufuvukekele.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376dc1e7bf6---bezemegajasilo.pdf
    • http://timeyear-v.com/userfiles/file/31534135437.pdf
    • http://elcolono.net/userfiles/files/nanebupax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+return+of+jafar+123movies
    • 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_off0000c92c.bin
53b32d20e2be2a1b2b1bdaaec2e69ff5c42d0bf7c6399b695b5537a925bf4d11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 11036 bytes
font_01_sfnt_off0000e2cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 16792 bytes
font_02_sfnt_off0000fae1.bin
74ce7ae1efd7e00859d985976eb7380510de257bb046d65e02b0a8899d53de65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 17272 bytes

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