Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a3e52be07360cc…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 11:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9c2e65bbb93a3e8183da3612fe020b7 SHA-1: c7d920d30dc4a27eb405dd69375913f8b02e6482 SHA-256: c7a3e52be07360cc47cea70294593cbaa6b65fc71c7c3a5f5ccb4e1c2967310b
134 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 PDF files hosted on potentially disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://arrayamed.com/userfiles/file/12909703883.pdf
    • http://k-ookuma.com/js/upload/files/zakiduzerogunan.pdf
    • https://hbfilm.ca/resimler/files/882956191.pdf
    • http://aptekarynek.pl/zdjecia/fck/file/64815201250.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614171816ad48---zorako.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/46843741d5a6c8e9ddb912841e8b952a/wuxisipe.pdf
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/77960179786.pdf
    • http://hcvitamin.com/webroot/img/files/desobofapilatozowewagavos.pdf
    • https://garnet-medical.com/userfiles/files/zegina.pdf
    • http://cppzone.ru/users/blogs/file/36558499819.pdf
    • https://thuaphatlaihanoi.net/uploads/files/fesijevobufizawesalevogom.pdf
    • https://bistakalikotenetwork.com/userfiles/file/18781381672.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puwajumixulus.pdf
    • http://ppogrimall.com/upload/editor_image/file/dinetekipapitovezitu.pdf
    • http://shesob.com/file/files/13608632145.pdf
    • https://abcoegypt.com/userfiles/files/lizudifaxovelixolu.pdf
    • http://clairerolo.com/userfiles/file/40480117027.pdf
    • https://urbanlivin.lu/userfiles/files/gajopakamer.pdf
    • http://waycreon.net/bhaskar/yii/upload/files/8006167770.pdf
    • https://jogamiskolc.hu/ckfinder/userfiles/files/9288285977.pdf
    • http://sukhonthip.com/file_media/file_image/file/2022881858.pdf
    • https://springkasteelhuren.be/userfiles/file/65233525255.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/dijilemudonemep.pdf
    • http://pxmonastery.org/CKEdit/upload/files/33849929273.pdf
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/71601494493.pdf
    • http://gewald.ru/content/Files/59465670300.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=veryfitpro+apk+download
    • 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_off0000d2c6.bin
d6152edf314278f55524d022f0dae792468e0d5eba2eb8b69af4708b2011a027		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C6 18008 bytes
font_01_sfnt_off000100eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 16792 bytes
font_02_sfnt_off00011902.bin
2ce175241eef44b75d6e21e5784989abfffc7aa6e28bb2a9abcd27aa85a3c544		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 10584 bytes

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