Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6efaf69b61799ad…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 18:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6da2286f1f9e0409f1cade067ebf8f5a SHA-1: 801d4702a92e5a5bd03cdbb2b3462d88981a7f37 SHA-256: c6efaf69b61799ad40cc8af4e08ae430a85a01d4ca7adc7cc659823617fbd5e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://2ds-creations.fr/userfiles/file/84117334973.pdf In PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e2e9271b---bewiwozalu.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/26555897053.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/dirapugiji.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/zesebegurubuzisokinax.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/54758302204.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/xozir.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/libuwunuvuf.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/32116437151.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/gafibi.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/4292347932.pdfIn PDF document text
    • http://hueide.com/upload/files/46810205292.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/fuzorob.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/21853944448.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/jezolaseguz.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/dupodewigavupafofuk.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/57043031684.pdfIn PDF document text
    • http://recrute.fr/files/files/62487651270.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/36440041297.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/94518342287.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/75533870177.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/14258323258.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021090105171263.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/sisaxubufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=first+day+worksheets+for+1st+gradePDF 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_off0000d8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 17572 bytes
SHA-256: ccc564ed94458ed9827c07a82099947df151bf44f7917a04e774d82147e32293
font_02_sfnt_off00011e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E59 10804 bytes
SHA-256: ef2d04866bbca00d6c5e3dd908d33c10c6b776208ae157b4de4eeeaa3a74f25b

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