Malicious PDF — malware analysis report

Static analysis result for SHA-256 223bb48c32fc7f6f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 00:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29d088ffff747fe7bcc84e24bfcf3c98 SHA-1: 85c0d7ecb87910d43066b0bdb3648a6d60c2ea34 SHA-256: 223bb48c32fc7f6f2173c1a1ae4833aa82e58e6e11fc8ff801166e4062debe36
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a link farm designed to obscure the true destination, and the ML classifier and ClamAV detection strongly indicate a phishing or trojan payload. The embedded JavaScript is likely used to facilitate the download or redirection to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krisoc.ru/uplcv?utm_term=project+completed+successfully+letter PDF link annotation
    • https://rowsontw.com/shopadmin/upload/files/figorikeguzatu.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/4720617928.pdfIn PDF document text
    • http://webbolt.fono.hu/data/editorfile/fafutuxu.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/puren.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/mujewadapogego.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/28107881338.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/mumawoziveseditabulome.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/53943659779.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/45807477447.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/dazasegekaposo.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613091555ff90---rajimalabifibowesoj.pdfIn PDF document text
    • https://rinducm1.com/contents/files/dofubenosidazatuposafa.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/timotitakaxegexovefuwanon.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/58563706375.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/mefadebabapogaruxijodotu.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/zonifuwafojiwagubid.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/zafogam.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zobifivopigezewumigoputol.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/87095748633.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/lebojiborovod.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631925116ginanopiruxopurotore.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/84228484594.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_off0000b19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19D 10768 bytes
SHA-256: b4ba22f2a4011d84d00e6b923f8e6699325f1f75fd812a6adc0f61ff8c71bced
font_01_sfnt_off0000ca81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 17564 bytes
SHA-256: 938ef49cd12133c5ced4f230db9fb83b9216d2f42427fcb0f93896e893ea67b6
font_02_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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