Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5831ce275fae6c…

MALICIOUS

PDF

72.4 KB Created: 2021-09-14 04:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1197d97101134b94434a55c59cd4b32 SHA-1: 44b3c69620e7dc1e1661f3ddefb07c9c07eb39d5 SHA-256: 2f5831ce275fae6c17894dae0e7ab45c5aa1acf9990970869530c6fe975f493d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI heuristic, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://stellamaris.cz/userfiles/zonisolutegan.pdf
    • https://agrando.cz/files/file/7845699124.pdf
    • https://sainaudit.mn/File/79938364544.pdf
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/69000119528.pdf
    • http://hoinhikhoavn.com/img/files/23542421532.pdf
    • https://jmclimatizacionhvac.cl/images/subidas/file/vusuxutirixupog.pdf
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/vapimag.pdf
    • http://abwlanham.com/uploads/files/kenixuzokes.pdf
    • https://hongdung.vn/ckeditor/images/files/piziw.pdf
    • https://wegofa.com/userfiles/file/36672788337.pdf
    • http://healthywithhart.com/res/file/78931129057.pdf
    • http://ozkayalarlojistik.com/userfiles/file/83290485233.pdf
    • http://studiopedrazzini.eu/userfiles/files/faligenimoxuwesana.pdf
    • http://metabolitplus.ru/files/file/32702016973.pdf
    • https://hoya.hr/UserFiles/file/jumixawixubevi.pdf
    • http://islenapuntos.com/campannas/file/sabaziwar.pdf
    • http://aa-nusd.jp/nuteroxoxin.pdf
    • http://eperon-kochersberg.com/img_db/1807073890.pdf
    • http://ddservice-bmw.pl/userfiles/file/xejafesexemapetezidi.pdf
    • http://piazzademarini3ge.com/userfiles/files/juxubiwusarawiledujesip.pdf
    • http://thedreams.cz/files/54439485986.pdf
    • https://grafconsulting.pl/Upload/file/zepajubixonesobunatonakak.pdf
    • http://balalajka.nu/media/winisavegiwodupuragito.pdf
    • https://alexspa.pl/userfiles/file/ledebubujifer.pdf
    • http://xn--z92bzy85x.com/userData/board/file/27804354991.pdf
    • http://miyozenemeryville.com/uploads/files/vexubose.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=spyzie+cracked+pc
    • 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_off0000baa4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA4 16792 bytes
font_01_sfnt_off0000d2bb.bin
d87f4debc7e3eee84c3f20e299c80c1a6404d3b89ce6bc60f84da4579d8515db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BB 10312 bytes
font_02_sfnt_off0000ea27.bin
85685e4871a1875c6ca2688ba5b7bc997ac68991209873e451e801c998d17b50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 16484 bytes

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