Malicious PDF — malware analysis report

Static analysis result for SHA-256 842a3f444b95bbd3…

MALICIOUS

PDF

81.3 KB Created: 2021-10-22 09:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7df44c06105bda0d550f9bc238330c7a SHA-1: 8b1dc8d2386dbae56dc89b8beed5976e789cb16a SHA-256: 842a3f444b95bbd3f93ee8b2bf422a5a6ba758fdf27d5f59b159d45dfa2fc868
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical ClamAV detection and the presence of embedded JavaScript strongly indicate malicious intent. The PDF also functions as a link farm, directing users to multiple external URLs, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for initiating the malicious activity upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3778

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://gazdalkodjokosan.hu/img/userfiles/file/lexiwud.pdf In PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/60001372414.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-10-7/20211007160247376120.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/33170997818.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/dafodixos.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16149c201f32b5---26471563992.pdfIn PDF document text
    • https://granitnet.hu/editor_up/93817350698.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/lateruluferugi.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/jufubiwizejo.pdfIn PDF document text
    • https://afma.pt/site/upload/file/40689500507.pdfIn PDF document text
    • https://zakazspbwatches.ru/upload/files/58870280206.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/50322346662.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/risabiruzinasor.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/121255216441.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/17044223297.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210913_161706.pdfIn PDF document text
    • https://bunianco.com/other_files/File/93184187999.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109262336081543.pdfIn PDF document text
    • http://dejonghenico.be/sites/default/files/file/6723812658.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/95901204359.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/80624505570.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/51422612622.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/77206533262.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/4dZi1sgP-vI/uplcv?utm_term=horde+leveling+guide+wow+classicPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 10688 bytes
SHA-256: 5fbe354d44c5f63f1e0098544869e58cdcc45a2e6d007cea0eff59fb02cfe734
font_01_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 17180 bytes
SHA-256: 4127071e7c3034f7af574c2b297d45781d385da0945e05b14bf985ccf75a5cc7

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