Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa88d864093eb96d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 20:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0c1a51fd53afcc826b3fed7cd4d4b682 SHA-1: 4cba53b8e54e92c8480cac8b55a1b06576973610 SHA-256: fa88d864093eb96d602482824c1828475976d50e857d35d09540ca495b93a49b
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 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sashtraayurveda.com/ckfinder/userfiles/files/70943823159.pdf In PDF document text
    • http://vonschickenfremont.com/uploads/files/43708556962.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/54891897234.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/xinozujagofa.pdfIn PDF document text
    • http://winso.tw/userfiles/file/49659176939.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/rapajijekiveza.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/41290227439.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/23913767056.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/notolokijemeset.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137645b20aeb---63622000952.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/48339018060.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/nofaredarumadag.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/14188984811.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/93251153249.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/jasafox.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/93975362820.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/bixivexibedezasaporazinun.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161334c0a621aa---70405108479.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/9524369269.pdfIn PDF document text
    • http://quetthe.com/upload/files/kapuvamuvofufokufevuta.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/57538367445.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/54704385681.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/202191101041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=trapped+with+the+ceo+pdf+freePDF 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_off0000d0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EF 20060 bytes
SHA-256: 069f1d4e27d001d2ce3acca87ff184380f852e12e24030b15d0eaeee3747a3d9
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 10448 bytes
SHA-256: 0a883d9e3f9e695abb7861e6717cd1475dd8fdb2bc61107924136f34b92dd8a2
font_02_sfnt_off00011ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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