Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2df23d64951aa3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 04:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5cc358da4a3da0b43ab0932d8ca367c9 SHA-1: 704cdbb0feb1fe06aff3969dfd453d3e65b12133 SHA-256: 2b2df23d64951aa3c671af63a8707cb22e83ce71a2acb6213ea8620e93f30903
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 31 embedded URLs suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://medvor.ru/uplcv?utm_term=anjaam+pathiraa+with+english+subtitles PDF link annotation
    • http://otvorene-srdce.sk/userfiles/file/94822950347.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/80987933650.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/23084414357.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/22307696235.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/welisufo.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/70727608250.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/44230849038.pdfIn PDF document text
    • https://apra.pl/files/file/8765025266.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/morupusefofukan.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/2238174981.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/takudopopezudelobi.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/luparesutede.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/73756588802.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/29726782996.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/keporokumipadozixava.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/basifizijubilirotineso.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/59364841597.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/25769739369.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/87987260147.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf5669538---4011800665.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db502b05e9---39042993804.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/donomexejufov.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_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 19628 bytes
SHA-256: 6bafdcaa142ab2dbaead342e2d432c92c761185028a8df3b06858f4024528cdd
font_02_sfnt_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 11016 bytes
SHA-256: 8134fc646b7e27955ba962a5c13ff57e44d161f20855ad9ea05f46467460e6c1

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