Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1cdc86e9424aa0…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 15:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b7beca72ea2c40d05138737854960df SHA-1: d8563f681f9fd3b01a21306aa019efa80161066f SHA-256: 9f1cdc86e9424aa04c71ff6dc45a6c6d8bf251e621e97d279b4c4314b8e3d167
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded URLs, many of which point to disposable domains and are likely used for phishing or to host malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the presence of numerous unknown URLs strongly suggest a malicious intent to redirect users. While no scripts were directly extracted, the structure and URL patterns are indicative of a common PDF-based malware delivery or phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://alrabbancapital.com/file/files/tumirajivodorizoj.pdf In PDF document text
    • http://vimar.ua/userfiles/files/3254183046.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/retajebenurafoxiz.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/vimafuzesudamewawive.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/55539482723.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/depoxodonerigad.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/19176008309.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/takiz.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/savasifafulekameruz.pdfIn PDF document text
    • http://guowangcable.com/d/files/vuvatebewozirizosaz.pdfIn PDF document text
    • http://electric-kernbichler.at/xenip.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/23960152975.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/3654633826133ecd979463.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/luvepojup.pdfIn macro / runtime command snippet
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a5044280a96bc29b27d70d9b3ae71116/14615228538.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/xusareje.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/rakuserimosekoxilo.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/10465995011.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/81215182011.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/62661050772.pdfIn PDF document text
    • http://polkovnik.su/upload/file/32589348890.pdfIn PDF document text
    • http://rainhouse.kr/datIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=six+guns+mod+apk+unlimited+money+and+starsPDF 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_off0000d0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 19032 bytes
SHA-256: 9037e5f2edca883b629a5c57f8d656060061ed40aad579bfd243d4cbdf59641a
font_02_sfnt_off00011a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 11220 bytes
SHA-256: bc9a20af41c3ad8dd96b5c1181fc11510f2921a63ea43a225d47b99f387b9cd3

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