Malicious PDF — malware analysis report

Static analysis result for SHA-256 a359f465f6685b7f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 09:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7e1b0788b16002ad05fe4f5f20d96e9 SHA-1: 1c10541dc47e0c3e43c18998f9a02b347c7ed0ff SHA-256: a359f465f6685b7f7ca6ea83038bd19992c1f12a49f9cd68c8f3931d0f62d65b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to domains that host PDF files, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://albizy.com/ckfinder/userfiles/files/xisofugavuvuneg.pdf
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/83108859974.pdf
    • http://vividconcept.in/userfiles/file/17698473680.pdf
    • http://dsacare.com/admin/uploads/file/41966324152.pdf
    • http://bronia.org/userfiles/file/50134790085.pdf
    • http://gdwtechnology.com/fckeditor/file/fagekipin.pdf
    • http://hiroshima-teishaku.com/userfiles/file/38296695458.pdf
    • http://twinmd.ru/userfiles/file/genivomofupekivujudenan.pdf
    • http://connect-event.fr/ckfinder/userfiles/files/wosawar.pdf
    • http://instalace-charvat.cz/userfiles/file/27320833959.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e827a4dd---veduzuzapewupafik.pdf
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/96730807171.pdf
    • https://tideandtigers.com/ckfinder/userfiles/files/zujaxasukevotosawebatow.pdf
    • http://transchem-tech.com/Uploadfiles/files/32829933219.pdf
    • http://kco.su/userfiles/file/26627415821.pdf
    • http://bobmeetin.com/media/galleries/files/jimedovigejuwafodovojeg.pdf
    • https://neksav.com/upload/ckfinder/files/43596787353.pdf
    • http://abw10thstreetne.com/uploads/files/logudelilanutisidabojodu.pdf
    • http://esenkardeslerinsaat.com/resimlerfiles/26826137157.pdf
    • http://iaestedresden.de/userfiles/file/25331310149.pdf
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/resajazatepoxidexopireno.pdf
    • https://yuvasarkar.org/userfiles/file/durabosufibopotavotiz.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/0gt69kmb1qtr9kq7e9k3f5qec1/regisitulixu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=extreme+car+stunts+3d+play+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dafe.bin
016ba4d98dca5a0f829bff150fb7e4b1e277a5af8f88b20316165f3209eb7adb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFE 11148 bytes
font_01_sfnt_off0000f51b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51B 16792 bytes
font_02_sfnt_off00010d2d.bin
1f89b67195f8a639cef89749946e138cb64992fcd7ca35f89c35353ef78879e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2D 17000 bytes

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