Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47fb90f212d2c2a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 05:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a9de02c88d77967058ec349b4cbabed SHA-1: e00f5ae26286967fcde6c5b8f655e13aa9b30720 SHA-256: b47fb90f212d2c2ad9d94fd06789668bd6e703e5277870216be6948e13bcfc7d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also hosts a large number of external URIs, many of which appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript and numerous external links indicates a multi-stage attack, likely involving the download of additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=epub+reader+for+android PDF link annotation
    • https://floridahouselottery.com/test/userfiles/file/gereze.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/38733648543.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/40575903511.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/baxele.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/norepupasopikez.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/25097515506.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091602323073499.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/tisozaxepuzadabumejilo.pdfIn PDF document text
    • http://balone.net/_upload/file///13001260032.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/buzukowonuxawalofunejaji.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/41392394773.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/rijafalarusi.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/rovoka.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/34831476118.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/pokidovufarimonigofakobiv.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/6608763242.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/f4vubibnn2k427e0mh0leecvr6/xoxod.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/86879451403.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/53580071762.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/1360344740.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161316e00aaa5f---pilimuma.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_off0000d287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 18064 bytes
SHA-256: e0afd5a6e41de27b5810a01e24e7d5fadc80783f9e906933e7e8702e07d7785d
font_02_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 10404 bytes
SHA-256: 48115e6fbf916bb08986f5ac188892f2eece488b5d4a06d45609f330ec0da383

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