Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2c8f563c9dde7b…

MALICIOUS

PDF

78.6 KB Created: 2021-10-05 01:52:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 827df5d465cc3a83751009db45b4b3be SHA-1: bd0c9b595db037ad423f29c0da2b2abfc35d3fe7 SHA-256: 5b2c8f563c9dde7b2ee0e1458f44eabbe200bedef0d29f0ce7a9056fb8fa35cc
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, indicating the PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://dermatologomiguelgallego.com/miguel/fck/file/84463235295.pdf In PDF document text
    • http://iehyun.com/editorupload/file/giwuzo.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/kubopuvaxelaneliv.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/kuvokogepuvakoliwiku.pdfIn PDF document text
    • https://stvorki.ru/files/file/surogi.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/kedodaf.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/12988549506.pdfIn PDF document text
    • http://bptramptour.pl/files/file/kasaxetopazomupefebe.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/razomuzib.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/lidewetopikixuluwefovazal.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/70132815643.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/jabejetefufaloxi.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2ae3664ea---23027348209.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/bipubeduriz.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/4399691254.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/lotomenikalokeluzomu.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/10877649217.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/61271927278.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141cbc70c5d6---15159775401.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/feredubewipogekofaz.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/8489713390.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/nafokozirotapir.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/rezim.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/tarutokijixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=same+side+exterior+angles+definition+geometryPDF 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_off0000c5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D9 20340 bytes
SHA-256: 01e494fb805b85ffd43dc4219e5530bcefe60f06ae8f1a66a4b459a0f21978d4
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 10988 bytes
SHA-256: 5e0f6e927e7a4d63185628fbfef18671df3bf52deb90739931eb7e34d3a781be