Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b407c29b054b8c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-10 21:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 44b38f9d83318d99b01ab3379d5b442a SHA-1: da2e532bbe7f0efd41d9112d0d0e929061684deb SHA-256: 84b407c29b054b8c265152c1d4790df3d9627fed2a882c2b83727ebe803e95fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://coretry.ru/uplcv?utm_term=mod+for+gta+vice+city+android PDF link annotation
    • https://luxesystem.site/js/ckfinder/userfiles/files/vusafegapixugup.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/65128679381.pdfIn PDF document text
    • http://teakdeck.pl/files/file/3641530284.pdfIn PDF document text
    • http://yoron.net/up/files/72311360796.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/30319882062.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/mixebe.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/43258278045.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/rujunidifuxawigivozederu.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/24329725757.pdfIn PDF document text
    • https://subarini.ro/mm/file/luzizuma.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/dafodomamufujomu.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/toxuvikila.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/dafadofukilorut.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/84190145272.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210901185058.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/2113560307.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/zalojojuvonezibibagi.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/57744877549.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/gaminekexinipigoxogixir.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d3f28057---sugosekokikado.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/96652027151.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/posiletejamilenagive.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/95049941460.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/280914093.pdfIn PDF document text
    • 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_off0000c28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 10612 bytes
SHA-256: 050b5cada18d61394b510873319ba92867ad2c6d9cb820ec7244f7a313036c8f
font_02_sfnt_off0000f2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DA 16900 bytes
SHA-256: 9be2715ac7c5e99ca989d7f75d019129054d640662bbb64928e868b9507fd7a9

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