Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eaa4e67ffb2c8ba…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 18:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a8ad8508f72b51d34ce1866e261ef18 SHA-1: 2a55dd0f35799dbdc47110755c0d146e9cbb2f28 SHA-256: 1eaa4e67ffb2c8baa6ee34a2ec81792addcead0c61264d7c5556926de0c3f64b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous external URLs, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to drive traffic to these sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=the+book+of+unknown+american+pdf+free PDF link annotation
    • http://choragwica.pl/userfiles/file/daruwik.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/jiforuw.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/fitolikasotafipirif.pdfIn PDF document text
    • http://vizcsap.hu/files/file/sugozigonubijo.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/23067439863.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/5984d6561172588bce2ec8c4f638bb18/62837041455.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/bibaxinufef.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/fiforuvolaxikanuz.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/67752967293.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/55396203379.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/gufokosijibaguze.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/nidinapom.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146927c2e2d2---pusifug.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/xibekigosuvunovusulen.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/75372529574.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/65176658175.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/25406724732.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109171622586887.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/filufupegupuvugasasetasep.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/nizojugun.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/lofilifagurajis.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_off0000ac3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC452 10952 bytes
SHA-256: 110be77cea541754d34f6250c4d9f4767e2eeb102dcd4070b823249500e54fa9
font_02_sfnt_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 16476 bytes
SHA-256: 21958113e1e1ac98a583ff6f5d73816d81ec89f3271c2e758b0247a0a9b0a914

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