Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed438fec009313ba…

MALICIOUS

PDF

71.4 KB Created: 2021-09-30 21:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8262264945149aa2d0773e0bc1ad29bf SHA-1: 8dfd2c5740c1d33c83b12f95c212907014bd1f84 SHA-256: ed438fec009313baec8f75de3f17be4effd37bac54134c6359edbfd07d184851
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. It also features numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://evopizza.lt/ckfinder/userfiles/files/sovuzurodojezewotofola.pdf In PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/pewolelipupusupomunovax.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/2316468184.pdfIn PDF document text
    • https://baptistfriends.org/media/85262484501.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/79905999178.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/bofasunejezako.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/xafanimawexipezome.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/33029708694.pdfIn PDF document text
    • http://01host.ru/userfiles/files/87104241860.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/34047230814.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/40487428177.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/48686659982.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131564843af1---69880739173.pdfIn PDF document text
    • https://duvanco.be/docs/files/mapazakogefadil.pdfIn PDF document text
    • http://186086.com/upload/files/gasusuzud.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/48014676054.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/88976131271.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/98733320516.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/gukidemogitulikevuniba.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/pejaxamefakuvaxofibetajad.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/27085083162.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/31734717423.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/bijumov.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614329fe7a468---83245694277.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=batman+the+dark+knight+rises+full+movie+freePDF 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_off0000b336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB336 16528 bytes
SHA-256: 9636de5c1bf929f8ee6bf891363d4cca844469ad3dd7ae668490a4243911ddd7
font_01_sfnt_off0000ddeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 11112 bytes
SHA-256: d2c5ff5168304cfb341a43466c1181646cc2bc17ed2ad08ff02fec048a30a9d7