Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6bf3b460a87c293…

MALICIOUS

PDF

84.1 KB Created: 2021-09-21 02:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c0f1d78ea9365a298a9ebcf0dd58b2f7 SHA-1: dec63d24e839fd967a7ff4bece8a43e7607542e8 SHA-256: e6bf3b460a87c29386b79752ad7063c8cfbac483a52e2c38756f29ba2efcaf7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as unknown or potentially malicious. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for a large number of links, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://kraemer-duennebacke.de/files/file/41293983237.pdf In PDF document text
    • http://ptichile.cl/userfiles/file/69485884864.pdfIn PDF document text
    • http://santinitravel.co/files/others/jufujukaxake.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/93010873445.pdfIn PDF document text
    • http://precisao.org/files/files/gebimekikasa.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/50926129011.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/kedevonozali.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/49865338548.pdfIn PDF document text
    • https://kvzriu.org/images/file/lijebidi.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/77829410420.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/77013088644.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/29157319909.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/jibekezikiwewa.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16147dc373e393---pawepesufadabeperovu.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/79984382209.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210901065013.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/46510063683.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/notapulovobabosebiw.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/51427360860.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/burosix.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131914b3c0bb---7688445070.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/84561882017.pdfIn PDF document text
    • http://caramelitos.sk/files/7372119398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+free+gems+in+dragon+cityPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 18072 bytes
SHA-256: e131a798014f689822d427603ce7e90e2a74006c26213c98ffc8cb08d0f791bf
font_01_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 10964 bytes
SHA-256: febb69f44e691234e1c00280392b1985495f0be81cf0a673811210b8d9d74115
font_03_sfnt_off00013943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13943 1948 bytes
SHA-256: b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa

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