Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb45f1e4a819d397…

MALICIOUS

PDF

77.8 KB Created: 2021-09-21 20:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dda0dde37395b39d09c6baa7571f0c81 SHA-1: 8f4f1cb46ff8d46b0120fb840abc0280092ab030 SHA-256: eb45f1e4a819d397b285d3d0650dcf5f9574b8829a031bc06e88da1287ba80a3
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and embedded links suggest an attempt to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://onestep-tokyo.com/userfiles/file/padazudadokujinunukijur.pdf In PDF document text
    • http://wagnerpc.com/userfiles/files/87197375528.pdfIn PDF document text
    • http://ewtch.com/upload/files/kotunosenatakovo.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/6773042887.pdfIn PDF document text
    • http://showdoimovel.com/files/files/21740335279.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/37373978190.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/10498213514.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/32942587961.pdfIn PDF document text
    • http://floramarble.com/uploads/73475994247.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/19969231488.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/kasuxar.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1f84d7860---48086861496.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/figarikemavefujajufiwawok.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/biruwepow.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/pivukanezakixemonegemi.pdfIn PDF document text
    • http://fabtur.ru/upload/files/wufujewepakap.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/46357986935.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/16179508445.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/99889114690.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139a503386bb---33750154732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+fortnite+fashion+show+combosPDF 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_off0000ce0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0D 16868 bytes
SHA-256: 742027a79849add64aa76c19daa7092084157c93fbd4c1171cc5b8b96d5bf8ef
font_01_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 10832 bytes
SHA-256: 59d86a08193fc49388f82653efab329f88867f6d5c27f40838753d4c547e51de
font_02_sfnt_off0001122b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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