Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac98a7efda6af2a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 02:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e4ec4a6d6f5d8e5d7c59470d4e55261 SHA-1: ae12d091717a72dc01aa2648e56b21142aaa6cdf SHA-256: 6ac98a7efda6af2a72b070632590359247acd576cf28cf3fadfbd3a1c65cb946
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, likely to distribute malware or conduct phishing. The embedded URLs point to various domains, reinforcing the link farm and potential distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=how+to+format+sd+card+for+android PDF link annotation
    • http://anm-av.de/uploads/files/27295515349.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/58623405369.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/regopideguvaxipakapusim.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/xedegedunapaluwure.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/73691031582.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/54508979585.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/benazin.pdfIn PDF document text
    • https://dm288.com/slicice/file/genaruzeletabitajulitipud.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/41702236003.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/9872481899.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/83854985913.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/62037474584.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/wegidobov.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/xuxiteb.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/dugujiwebivoru.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9469a6a61---seximi.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/20554729559.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/mutaluw.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/xexagexibasidegujuga.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/nanegonaruranat.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135c513ad583---rixifikijana.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/bizamaxinuxajovibunifegu.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/mawowulipuraxof.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/21871490046.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_off0000d5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D8 10536 bytes
SHA-256: e1b6f5197bfcd13902caef0e1a692e9655f5aba8adcdd2fbcf2e2c106a70868c
font_01_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 17760 bytes
SHA-256: c63206d986c3aad338150c944306d3a938cb8d4efde0a041398ef0d88645906d
font_02_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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