Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4c306d2b882ad7…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 04:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acd6f39c0ab656e0136fb4db8324f53a SHA-1: eddaec05c221eb63fe7ac3680d687bbb77b6032f SHA-256: bd4c306d2b882ad7ab0b1f2c1d674f2e25bb8ae8109f72206114e87eaa13914f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=reset+galaxy+tab+3+to+factory+settings
    • https://www.truck-transport.com/ckfinder/userfiles/files/rizizizepevileri.pdf
    • https://vetregistr.com/ckfinder/userfiles/files/82448712402.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/58268657351.pdf
    • http://ekbdrive.ru/ckfinder/userfiles/files/50004334804.pdf
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/32663462303.pdf
    • https://kawanmto.info/contents/files/welidapumimozinozi.pdf
    • https://www.hkha.com.hk/ckfinder/userfiles/files/kapaxopok.pdf
    • https://balajitutorial.com/admin/userfiles/file/82870430864.pdf
    • http://nutronicltd.com/userfiles/file/59029604941.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/77971698087.pdf
    • https://nnt52.ru/userfiles/file/regiruxusewanafixox.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/16521501839.pdf
    • http://tfforming.ru/d/files/22861873828.pdf
    • http://euro-ex.com/images/blog/file/17056833572.pdf
    • http://teranor.com/ckfinder/userfiles/files/fuvowaxog.pdf
    • http://brava-ekb.ru/userfiles/file/watavavawimukesobuwisa.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/9600634541.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395843f237d---77993154996.pdf
    • http://vo23.ru/upload/file/rerigilinafegirut.pdf
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/kolibo.pdf
    • http://audidalys.lt/ckfinder/userfiles/files/60878597539.pdf
    • http://dasbluemchen.com/rolatukuwari.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/59898398555.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_off0000d9a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 16792 bytes
font_01_sfnt_off0000f1b7.bin
c989ed4a1245989bf9975fd6783ad11a53327d14b3c3e7112a94fb5a52c2bdca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 11084 bytes
font_02_sfnt_off00010bc7.bin
fc0117964974b9505e5bfb8a0853be87338e78828a1858632d8a5b200e79801f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 17320 bytes

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