Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6237c72688a483…

MALICIOUS

PDF

79.7 KB Created: 2022-05-29 22:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: bc153473878c66c26b67d7d10e492d00 SHA-1: 01ec31feadd6c4b7dfae7821008153c796cc712c SHA-256: 9c6237c72688a4836b1f206a713090a41e0575f4a3ede2f184cf606c6c26ec64
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded JavaScript stream and an external URI pointing to a suspicious domain, which is a common technique for delivering phishing lures or second-stage payloads. The presence of multiple external URLs further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sunuf.co.za/YmrXLWy8?keyword=tabe%20practice%20test%20level%20m%20pdf%20printable%20free%20online%20worksheets
    • http://fbrasil.com/userfiles/file///zetezi.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1627dd45b9b6a3---todaroxumalituworasu.pdf
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/gapijogudoje.pdf
    • http://www.guidanceias.com/assets/files/plugins/kcfinder/upload/files/20284777104.pdf
    • http://ayhancevik.com/images_upload/files/26382157529.pdf
    • https://happen.webasl.com/userfiles/file/xedonidaxufepuk.pdf
    • http://effekt-film.de/files/file/tupixel.pdf
    • http://stressmanagement-karriere.de/userfiles/file/97454315174.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/162473e10ef3c3---zixejanutosigojipefa.pdf
    • http://flexinform.com/hirlevel/file/kojepikabisowijof.pdf
    • https://producedepot.us/userfiles/files/ruribikarezisedibawanu.pdf
    • http://hoangduy.vn/vn/files/61315883668.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1629254c49f7ec---jurowexu.pdf
    • https://www.worldpco.org/includes/js/ckeditor/kcfinder/upload/files/walujozikeziti.pdf
    • http://kaav.org/kcfinder/upload/files/26367738399.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1629175bfb3947---pijefedezajedagibiza.pdf
    • http://kaupa.cz/userfiles/file/94184740720.pdf
    • http://riverla.vn/uploads/userfiles/file/repivonususosixorinugoge.pdf
    • http://np-laser.com/upload_fck/file/2022-3-21/20220321205010869475.pdf
    • https://5ky13lu3-1251.com/contents/files/mokewad.pdf
    • http://madiagranitosilano.it/userfiles/files/wuzufosunimodawinalizade.pdf
    • http://foto-recepty.sk/images/fotky/magogopabide.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_off0000cf06.bin
f953f33889b1415bfcccd430bb8296baf94c4f348eb206bc1519d85b37ef9174		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF06 17236 bytes
font_01_sfnt_off0000fbdb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 16792 bytes
font_02_sfnt_off000113f2.bin
be30f3742dc2ae6f98942a0e345bbe777bf521a19e41f5797ac6caa06570a1c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113F2 11232 bytes

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