Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8e7e044790bf7a…

MALICIOUS

PDF

84.1 KB Created: 2021-10-09 01:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 11658d921082d803168a78eafd091bb3 SHA-1: 78320494d19b4e22311532cb3538d5dcd9081b59 SHA-256: 3d8e7e044790bf7a526a3fb09dd9ee6d8c937f2f57dd7661e7234a8591e90c57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mytopics.it/uploads/file/fiboworivu.pdf In PDF document text
    • http://abwlargo.com/uploads/files/4980185136.pdfIn PDF document text
    • http://soc-in.com/data/media/files/jenivevomumix.pdfIn PDF document text
    • https://kaparatt.com/images/File/lopojeve.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/57712275875.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/jixezazew.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/61114398057.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/49644664083.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091702273373499.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/46432459643.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/jamoxufajog.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/47551464864.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/zozanel.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422b6bc506---48246554914.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/danonegasekefokexikudavo.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/memusuxatub.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/61177543316.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/paveromu.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/vuxezajoz.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/61690642406.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/46235629702.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161454505c13ea---29004070244.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/94530164791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=on+some+motifs+in+baudelairePDF 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_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 18544 bytes
SHA-256: 9886ed92f2372fcd5c77f612eaaa11580ca97118da3f3c3b8d8abed6d6b49fc3
font_01_sfnt_off00011247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11247 10780 bytes
SHA-256: 23fe9267e7b7a5b3531c03db3b554cff09f6119a20a45af2e4c90c1ab87582ae
font_02_sfnt_off00012b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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