Malicious PDF — malware analysis report

Static analysis result for SHA-256 6325d78fc444a764…

MALICIOUS

PDF

79.3 KB Created: 2021-10-18 08:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b483039a90e285d7c7d2f3f4b2f5adc SHA-1: 511480e826e433e1276609780a4a6e4de85acb67 SHA-256: 6325d78fc444a7648229af799e380ed12cd014daa93dbe21de34e6e5a30c1797
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to potentially malicious or phishing sites. The PDF structure and embedded links suggest it is intended to lure users to external resources, likely for credential harvesting or further malware delivery. Although no scripts were explicitly extracted, the PDF format often utilizes JavaScript for such redirection, hence the T1059.007 technique is included.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=i+130+for+siblings+processing+time PDF link annotation
    • http://trivio.it/userfiles/files/zukotitapatobujojiveku.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/vilejivovubijabumil.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/60478214611.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3d57fb16---99769998371.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/85659129765.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/kenupuvoferomanadikew.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/zefatavemi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6880256851ea478dc053d1408cd6f08a/69551739216.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/89807335397.pdfIn PDF document text
    • http://szhlfz.net/upload/mejasiwagagujinazuxakimig.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/xepete.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/wonelewase.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/kanudokibidalefuzijar.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-11/images/files/92710668310.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/gakesofom.pdfIn PDF document text
    • http://aztkgbv.love-mrt.com/upload/files/14683046050.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/94405351264.pdfIn PDF document text
    • http://fivelscope.net/fckimages/nisobodajujexaxusa.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/wizadodivu.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/27919826308.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/bofipenikilotutejuto.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_off0000cf8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8C 18236 bytes
SHA-256: 6edc9064ed9d5593b2821b8b445e62a5b54ea8c6f19c50185fb99b95609df585
font_01_sfnt_off0000fe30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE30 11100 bytes
SHA-256: 3f8360b2a06dbc76c85903762b90fece7f3d47ea2aef3f3a3e7cf81bda118a79
font_02_sfnt_off000117db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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