Malicious PDF — malware analysis report

Static analysis result for SHA-256 63de89bd9f6b3be6…

MALICIOUS

PDF

81.1 KB Created: 2021-09-15 22:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e64388b36ebfd5b99c7814c0f649e505 SHA-1: 6cfbedb8eeab84b5123e28a068f99d081a4784b0 SHA-256: 63de89bd9f6b3be6d7770702da3856e32bae381f7938cdc3feb1f02a4af05c7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.bufolari.com/public/immagini/file/98964579001.pdf In PDF document text
    • https://manenshop.com/upload/files/39041566772.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/kebigatizotabiw.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210915_044457.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0aef7c30e---1689643962.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/63671975350.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/2692527624.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/dizesil.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/bitukameduzivozan.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/vamalazino.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/42400560690.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/sebiluvebusesixenumevidix.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/21535210190.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/40487484324.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/87217829869.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b9ceaad63b8c028fa72ed60ad02b82f1/12260826923.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/sesolesevosuvuzet.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/96534967014.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/volevenezagizito.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/kakifewixedoz.pdfIn PDF document text
    • http://seto.cz/uploads/kofexegaxaneliburazupa.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/97774907934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=filmorago+old+versionPDF 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_off0000d9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 17784 bytes
SHA-256: 1bb79909501c724d31fa06304ddc77101c93138981fbba317a5e11f8721d3d70
font_02_sfnt_off00011f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F54 10536 bytes
SHA-256: c9ba70360a3e0a5b702740fc36dcaf1515e731a4b6624e662dc3c5a6d315d959

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