Malicious PDF — malware analysis report

Static analysis result for SHA-256 407c32c69bd64f2c…

MALICIOUS

PDF

87.9 KB Created: 2021-09-24 12:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f6de6cc32fe93fa21b33f45ee30f5948 SHA-1: 493f00b36224dc62940de0218c4298a12e9b2c7e SHA-256: 407c32c69bd64f2c5a75eb861e51b5566c111bc052f856add97f3708ce7af473
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. ClamAV detection and ML classification confirm its malicious nature, likely serving as a lure for phishing or to distribute further malware. The presence of multiple unknown URLs suggests a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://happy-playground.gr/uploads/_uploads/files/95976897028.pdf In PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/tilogejunodisedisidad.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/kuwitalubizatikobalopuwa.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/wolitagevukeruwepiraluwo.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/44663813251.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/68988072503.pdfIn PDF document text
    • http://stisk.com/file/bobobetenuseloluvofedepij.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/totusononagufedukagot.pdfIn PDF document text
    • https://lemondedelaura.com/userfiles/file/wesetewolofamopoxivuzik.pdfIn PDF document text
    • http://gnox.vn/upload/files/76829276257.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/nusaxufar.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/rakaputog.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/benatefoxila.pdfIn PDF document text
    • http://czminghe.com/upload/files/nanoramowilusowinika.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/tivavifetekopuxuzikepad.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/kitivemuvaro.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/rozipuvebamabudokesek.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/88335987225.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/vibelivubonoxomididegap.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392faf62cbe.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/46457037175.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/jenusitos.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/dawibetisozoji.pdfIn PDF document text
    • http://hkwwta.org/userfiles/26552828632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+call+recorder+app+in+android+studioPDF 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_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 19364 bytes
SHA-256: d1f1803bbc26c1d66fe9fa785f5b577bf6f5def5761e822180e0a504e20c670c
font_01_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001384a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384A 10944 bytes
SHA-256: 0508b87b0db489c70c2be3531097c9110983c4c5e29cbf2df84cda1c9574abf4