Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41c138c1eb245e7…

MALICIOUS

PDF

69.1 KB Created: 2021-09-18 00:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a816c18460d317a4fa4f3b302fccbd20 SHA-1: a9a8e30f77e4207e0cdd2d5dfebaaa8789981d3f SHA-256: f41c138c1eb245e7cadf9f6cc9a8bd51f45eb9684965cfd98c5f091ddfef3b28
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/voxozuxerarurajidugel.pdf In PDF document text
    • http://pomocnaukowa.net/Upload/file/velubiguwakuluzemuxuvereb.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/14137793231.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/60632500845.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/kefabu.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/jomurosemifapur.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/solupamor.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/lusunager.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/10340582965.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/mojorik.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/38920637961.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/21543824290.pdfIn PDF document text
    • https://maximaainfoways.com/WebExams/ckfinder/userfiles/images/files/11737509809.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/27953263272.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/55974771724.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xojusivibitonoxeben.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/wudejoxesazenexepi.pdfIn PDF document text
    • https://geniodelweb.com/file/wexivel.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/pimij.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/wisetilexosegagunitotel.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/rodonifi.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/felojuliwajogifalilevewuz.pdfIn PDF document text
    • http://pbpharm.com/upload/files/64695798497.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/37645456183.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/fovezamavopelowokulid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+speed+up+smartphonePDF link annotation
    • 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_off0000b230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA42 14804 bytes
SHA-256: 1c2060eb482be63201051d58b5cc7e86ed4f01d485c396097c29dad13ce9dc74
font_02_sfnt_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 10696 bytes
SHA-256: c5ee82977f81eddaa60b9eba1a9ed1a0174d8ce31513c38138201d2062f78db2

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