Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0521db8927aa308…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 13:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86c57ddcfe7407c5fe66a272e0e95973 SHA-1: 5218ad811b70db78280b6d0ca61807794df68a61 SHA-256: e0521db8927aa30875f0c5eb2d9b69c10dc7bad4dd99dd44b6262d3371db1b34
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to obscure the true destination or host multiple malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cantarefides.ro/admin/userfiles/file/68474300545.pdf In PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/26931887167.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441a3c04e14---33554972043.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161305aab891f1---fimimezodixanazubeva.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/tixesutumozaxejepikonaz.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/jogivasemawedap.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/69157157462.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/fetosapilogumewopipimu.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/34773982856.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/37475345657.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/matadukutire.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/fobusovafusukunopupewu.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/vititifofalovoxiremoraguv.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/duvevubu.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/bamabexojixijaxojabud.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/50510339788.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/6959488173.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/zaxebuwibejojakozupele.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/lizif.pdfIn PDF document text
    • https://harom.ro/files/file/24067128822.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/gevufokik.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/vesenuwexe.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-07-00-51-20-3bZ4l2xa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+find+apkPDF 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_off0000d5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A9 17612 bytes
SHA-256: f529ead207c9acd05bc871f19ab9be3f8ed66fd7a2049e09dec3f27eca05b8e4
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6F 10212 bytes
SHA-256: 3fd7ddafbc8f3f7bbb0b30fcf7c04de1440b97d5b1ecb396744bb01f7f245aef

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