Malicious PDF — malware analysis report

Static analysis result for SHA-256 9192ba0d5b0ccbda…

MALICIOUS

PDF

79.5 KB Created: 2021-09-22 16:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6eb55dbd4010be3c2652d13541b31643 SHA-1: 3cd940542de1b127fdcd6db67ea3cea4d7c26c86 SHA-256: 9192ba0d5b0ccbda3c324ff8d224862d527695ffb568e343e2409dff37b29cfc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to other PDF files hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating a download or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=snaptube+latest+version+2021 PDF link annotation
    • http://residenzaeden-albisola.com/userfiles/files/tobujuno.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/50999346535.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/39664584330.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/75532784485.pdfIn PDF document text
    • http://otczenacts.com/media/files/mixasubulinubavufebiw.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/lamuxisadozejiwafidavo.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/62f7c42c57fe5160269c499f6e5a47cb/wopebelipesajilo.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/40092037834.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/gokekisa.pdfIn PDF document text
    • https://uudanbury.life/files/file/15076359257.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/rukuxodisope.pdfIn PDF document text
    • http://dhf-china.com/d/files/96045290925.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b0d6801f---37705160138.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/46990632270.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/29222691273.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vabopixufebuxixazow.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/68438575046.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/45940669208.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/45208011901.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/noguxot.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_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 10920 bytes
SHA-256: 4e6a012a2bc0ba1b656cbba02dbb1f86e9d5c8cf5e5bdbf658a2393fc3796c7d
font_01_sfnt_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 18556 bytes
SHA-256: 71be7e8e6b2b2e9c0c3e9321e40967d1e2fc165b9fc6ac0dd05dc620400423dd
font_02_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1