Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b350e3753ebbcd…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 11:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 17e13fdeb985359a0c677fe36fad8a44 SHA-1: 634f51dbc94be315636b1f5add4bfd8839e4c0bf SHA-256: d5b350e3753ebbcd2e31c3caf934d99c70359e1f39ac5903819e748a00dd38eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable domains, suggesting a tactic to obscure malicious destinations. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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.
  • 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://artedeeducar.com.br/ckfinder/userfiles/files/bebudezonit.pdf In PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/josogef.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/bilomuw.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/bupujit.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/kotevet.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/mosaravexaze.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/97503051503.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/vojonolaganijulavelawoz.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/nigazi.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/bokadikeleji.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/sukuzasavopugakuwapowew.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/63793222385.pdfIn PDF document text
    • http://albergocavour.com/userfiles/files/10961104345.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/4282017112.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/zenozamumud.pdfIn PDF document text
    • http://hongdacable.com/d/files/zuwepafexunoguzom.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/gezosukimi.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/ferezukubemematelimowaza.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/rabejogenanodorasebavamo.pdfIn PDF document text
    • http://melabo.com/upload/files/zifutolokinifimowigone.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/81278358739.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/pupug.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/sebibutagu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161393ee0766c7---82719545144.pdfIn PDF document text
    • http://vhz.cz/user-files/tutoragusopezederu.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/migejari.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/64934002411.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/gukinewuvelolarop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=english+in+use+upper+intermediate+pdfPDF 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_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 10908 bytes
SHA-256: 2de4ef1fadbc75c95e6f6bca3595043c6454fcd8ca342926e13decab379d8ebb
font_01_sfnt_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 20960 bytes
SHA-256: c0c81e5bcc96e66755558db7928aa2d0c296b9be70e2ac9faf29e1256fc3ab5c
font_02_sfnt_off00012521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1