Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bb938ba9c3f2a4…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 19:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e01d3f26dfb29184bed00df67f35061 SHA-1: 3d38f9c6f400b09818c88ef5a3ab5c708dbcfac8 SHA-256: 48bb938ba9c3f2a479068d201e3e93ff16dc8b3213b1302e81142c54eb97bfb8
74 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 heuristic firings indicate the PDF acts as a link farm, with numerous external URIs pointing to disposable hosting. The ML classifier strongly suggests malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=indian+idol+2018+winner+list PDF link annotation
    • http://humidorio.de/ckfinder/userfiles/files/41817199606.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210904_FFE19868BE9D9980.pdfIn PDF document text
    • http://93564497.com/userfiles/18206197999.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/tejadokefonatomotal.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/69185743533.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/97802325544.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/rasixofuwitimikudadova.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/dojibopakato.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/33889599774.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/pakopetadoniwobozixapap.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/tejewuxut.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/10404772574.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/89591924477.pdfIn PDF document text
    • http://debten.net/UserFiles/File/30033896100.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/44086612842.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/kiwokazuvifebigumovoso.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6f6cf1f3a250ddf81667f0542424e498/xudisexituledefufuxir.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/95278303638.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/menofado.pdfIn PDF document text
    • http://fkhd.cz/data/img/wigodotugavagij.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96D 10780 bytes
SHA-256: a71070e0916108240b916061a472fd444782ddf815c5e1bd518e02c2cc069546
font_01_sfnt_off0000d281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD281 17320 bytes
SHA-256: cd718b6c692d57dd96dc6e006a77c431e76f49a81e3c60f1de11b439bff45652
font_02_sfnt_off0000feb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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