Malicious PDF — malware analysis report

Static analysis result for SHA-256 c346440193d744b6…

MALICIOUS

PDF

82.5 KB Created: 2021-09-24 08:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df999a7dd6dbc8277a8ac2fa0ce4763a SHA-1: 2ede4b735607bf58a9764380bc9240a2d351f5b8 SHA-256: c346440193d744b623eaea3b75bc270fe9be04ad9e96b72c5a80f6c578539257
74 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 domains and are structured as a link farm. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these external sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b33931b3b36ff94ab3485dc4798263c6/towelij.pdf
    • http://househouse.it/userfiles/files/muzopuwenexotonolurukovu.pdf
    • http://fundacionecla.org/resources/original/file/11015847161.pdf
    • http://lnimeina.it/userfiles/files/90608583152.pdf
    • http://guitarenko.fr/img/files/34199180162.pdf
    • http://juditphotography.com/picture/userfiles/file/46288330480.pdf
    • http://fanghsin.com/uploads/files/202109141020299970.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/tisinisewixomaramitusig.pdf
    • http://chieucoingason.vn/files/tilawefik.pdf
    • https://airxps.com/userfiles/files/mobisexajakibimop.pdf
    • https://sowlindia.com/userfiles/file/89431210726.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/9b2be434b85cb8d83f31ef09205fa686/wixoguwepigenogonurazo.pdf
    • http://topp.pl/_topp/file/83826642529.pdf
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/seletubavorexofefoguru.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/nuzukipelexexugu.pdf
    • http://etre-belle.su/images/file/godow.pdf
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/62897334352.pdf
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/bemelu.pdf
    • http://uco-kampen.com/media/files/murukexudeboz.pdf
    • http://yoshitomo-kokubunji.com/jcfiles/file/xodowedapogokadegijo.pdf
    • https://bya-ingenieria.com/ckfinder/userfiles/files/26466627480.pdf
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/53793140859.pdf
    • http://think6.net/ckfinder/userfiles/files/20210917204346.pdf
    • http://polyacer-ecp.com/userfiles/files/20210921_110848.pdf
    • https://www.puskinas.lt/ckfinder/userfiles/files/tuvawezizure.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=heroes+of+might+and+magic+iii+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000ee5c.bin
4ea13afffbcd9e2e0c11665823552956c9c33b4b869c161ed22a6e306b424bab		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEE5C 17032 bytes
font_00_sfnt_off0000bd90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD90 16792 bytes
font_01_sfnt_off0000d5a7.bin
7f103d3c98607bca4ca57e48558850fe8ea7f7169a86691edcf0d25af06ff261		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A7 10868 bytes
font_03_sfnt_off00010716.bin
cad99cfdb9e51a2df5f3d6529c9df4e618e3c206bc2da5e30900968b3099e869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 20860 bytes

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