Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7191b33b78667c7…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 01:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 036d5055ec946d977e7888c836a28254 SHA-1: 40423cbcfb35e466a410aee9caf05a726a95636d SHA-256: b7191b33b78667c7da358d7421658fd947c67ade83373e7519d672d206bf2306
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=back+button+android+not+working PDF link annotation
    • http://dd-eng.com/files/files/69792410468.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/10868319501.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/25667917719.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c806ee4331f3c6890dbe49625a42ecbc/11939962544.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/sajodaxesaremer.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/91064604058.pdfIn PDF document text
    • http://letdentalab.com/img/files/38724042785.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/mazenewadenudin.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/92658224003.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/ronukal.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/99809403590.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/xoxasew.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/seteposapab.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/maweregita.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/xixepikisari.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/nakasenilifukesumelaf.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/32118366826.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613597e1e8fde---vutelofiraju.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/kaposor.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210904_F7B989C3FC848F87.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/12406029116.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/vezavafuladivepolejasuw.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/69895319455.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_off0000b23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23D 10672 bytes
SHA-256: 626bd03400d9eced435e28a10225a4cbb283ac40be96af9c1727aec814f6332f
font_01_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 17200 bytes
SHA-256: c02d1d73f73d2a31c8577a2b3bd24974c021fa210ddadb6378ead76c1ef92043
font_02_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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