Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0102bc0473b6d29…

MALICIOUS

PDF

88.1 KB Created: 2021-09-20 16:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5e489bf5ae12e015dc1cae1b539e8ab SHA-1: 484003228e9bb1fa1e2a812c86edc6307d13935c SHA-256: e0102bc0473b6d29fc05f7c51cab6bb49f45b16e924e29e6113e351e5d9e8441
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains embedded JavaScript, which is a common technique for executing malicious code. The PDF also exhibits characteristics of a link farm, with a high number of external URIs pointing to various domains, suggesting a redirection or phishing scheme. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hinaweb.com/upload/file/jalojodarexuf.pdf In PDF document text
    • http://teakdeck.pl/files/file/3641530284.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/fogilal.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/30366240306.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/sitefano.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/12395025194.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/49610465687.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/boxipabuxow.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/wawivop.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/fejatugitir.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/4859312909.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/kijivafe.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145defa67fa2---64429985005.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/rumufamexofojafadaw.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/37087630513.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/60207226616.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/88492599507.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/xewapepowanozewis.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/labadegag.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/gebotujapil.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/58120931897.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/51458225293.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16140d623b4bda---rotosomunonazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=extreme+car+driving+racing+3d+modPDF 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_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 18384 bytes
SHA-256: a12b24abc82c98d04e96dca074a2ee3dc2b4565f320bafab09411ef878af7552
font_02_sfnt_off00013a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A74 10820 bytes
SHA-256: 7c3bf6b157334ce545eb03849173c19a8fac788882d1b42daaeb2e47fb5a8da2

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