Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea509ff57c66cb8…

MALICIOUS

PDF

87.8 KB Created: 2021-09-20 11:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c579aa167ab137c4fcd1b906161205f3 SHA-1: 01d0c9d4a7ce6197b872aaa956667bd65b99f811 SHA-256: aea509ff57c66cb8900d5f00dccd45323a4d2bcfab42e3a4b436f801575c1927
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://inwebjor.ru/uplcv?utm_term=android+praying+hands+emoji PDF link annotation
    • http://roocenter.ru/upload/file/tamodolugu.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/rudovifobufo.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/midigopoxirokoni.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/sexisaxobaxeg.pdfIn PDF document text
    • https://conrays.ru/f/data/79164569376.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7598c4c3f---64000269387.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/sakopekaziruxumukoluzoke.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/59908414677.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161438dde87937---kuvixe.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/beloxadatebiruforiwo.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/derawugilaku.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/ranojoroderanofov.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/24703677345.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/46199270176.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/tufizewegirujo.pdfIn PDF document text
    • https://clove7.com/userfiles/file/vusejofulegunanogidiroz.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/wonobululonavububapa.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/marekivaki.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/16847925247.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/paguzafixisoxabobezugaku.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_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 20076 bytes
SHA-256: ecb4f562bd05a6c80fed0fcbc423d0ae129bbdf53fecbea32aac9a5240c4fc92
font_01_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 10920 bytes
SHA-256: 67026217d6103675cb43970f992958da0be63e7f4e2950eafd71c3de4721b799
font_02_sfnt_off0001384c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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