Malicious PDF — malware analysis report

Static analysis result for SHA-256 89ff063c39509173…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 15:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04bd50e5f5ee771ec1f773ac43862144 SHA-1: b52f13fe664d36bb4a6ab1d1d290ac1d0d5f02b6 SHA-256: 89ff063c395091735ed70337b3fb3bbeaa47f01e164e3b797e6c048e3033da52
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. While no scripts were extracted, the PDF structure and the presence of many external links suggest an attempt to lure users to potentially malicious sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://zhongguohuachun.com/d/files/terepo.pdf In PDF document text
    • http://ukkies.be/userfiles/file/kaxanozerawolokipafol.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/zipadoboxikutasafi.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/409194518.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109100610351287.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/geponosafonepob.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/89119262054.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8c42939c---13668127306.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/woxizadobawikitazibomiwom.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/puwalogesukudugedo.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210907075456.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/jujaveluruvok.pdfIn PDF document text
    • http://irinabailey.com/upload/files/fexabutixoxenatimowu.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/vinugumisisab.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/wapumojezuregezuripekuga.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/katoratitonexijakuj.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/zunuxivosim.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/tajojilariw.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/zapejikofixepuguga.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/0d50cd7286903e0625a303a0b6319d7d/86121175938.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/kumorufi.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/56125903007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=device+id+changer+without+rootPDF 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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 18512 bytes
SHA-256: 6c87597f12e3e2f8a06724ba91fc64704450f79ee9ff2675cd535058267cc055
font_01_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 10688 bytes
SHA-256: 3fbcc52292730466c88b98a85b3e5456fc476cd2bbdd275cee38673bf3505cd0

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