Malicious PDF — malware analysis report

Static analysis result for SHA-256 f60618f439e0d9e9…

MALICIOUS

PDF

89.1 KB Created: 2021-09-10 21:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f9cb00904a35b27e216e93264b561815 SHA-1: 0c7fda78f3f77aae3ac325f1f9abc7ecbae4583c SHA-256: f60618f439e0d9e94f05f68c1bf1a29aa6b450f2741beebd10dcae136c2d8286
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://synerhu.ru/uplcv?utm_term=dua+to+recover+from+illness PDF link annotation
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/zokogifobekoj.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xuleb.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/xoturoxi.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/warasofitobin.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/duxinugifuwazujarezod.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/purerububanududovomunugam.pdfIn PDF document text
    • http://unseretochter.ch/images/file/wofuteduzibitija.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/goxasufanagovudef.pdfIn PDF document text
    • https://agrando.cz/files/file/goxula.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/fawibejekojuxixununo.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/60774349963.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/roxumugarizunesare.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/tetazuvatoraxuginik.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/10040320804.pdfIn PDF document text
    • http://186086.com/upload/files/4959653448.pdfIn PDF document text
    • https://ksuskalology.com/images/file/xaruwurol.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/76602984425.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/dalogigoxuwawisuzoxi.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/87993516613.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/pixabos.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64577717790.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/23059175560.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/mozodezapewakinobusufiwit.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cb9256e1---jufikupizulujusas.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab5dd9212---91427304898.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 10664 bytes
SHA-256: 2f42881c7861e63b4ff201e969c80892105f5cbf601febf7b84b75b49c8bba0e
font_01_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_02_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C39 22820 bytes
SHA-256: 41d338a547c7fb006811e51d9a4f5577a1f2b0d0e0adab059b9e54606466a70a