Malicious PDF — malware analysis report

Static analysis result for SHA-256 c38381e819bc990e…

MALICIOUS

PDF

103.7 KB Created: 2021-10-13 13:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bef94c925b8f5cfee93801d330b4eda6 SHA-1: 40bcbcdd851c89702c8efb85bfb736fc368396a2 SHA-256: c38381e819bc990eda3a22e47d3339b661ee5fcdc217f9f529b5bbbdcf6a2e12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and appear to be part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140103c7c3f7---porokuwoxefapusafoz.pdf In PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/datalelokowusulowej.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/83252493022.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137c7d2cd3e8---rufesalurabozosizupef.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/sanowevixegopazozipelaju.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/3839983602.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/jexawefagakipipipin.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/dovexubazem.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/wosajojutepezav.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/49826818124.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/pegumavizixevo.pdfIn PDF document text
    • http://proxima-design.cz/files/file/xukabejebiped.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/fexasujifagibelovukime.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/gokosovalekir.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/fezekupuxi.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/24183837977.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/juvexi.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/wizapoda.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/wejoxikovowibiwaduloruz.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/29851599219.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/47118837669.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/gomijote.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109290447178370.pdfIn PDF document text
    • https://siroyensao.com/upload/files/65981484648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/23D8k0Ec_6w/uplcv?utm_term=law+order+organized+crime+castPDF 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_off000127f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 10768 bytes
SHA-256: 6192bc0a00277986c073eed299f303a38579215a5b8b4d56f4abf5e3289c3ffb
font_01_sfnt_off00014094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14094 21684 bytes
SHA-256: e4279b2310191cfd5f98c3a594d63594151c76b55a931b0e85311eeae0759273
font_02_sfnt_off00017908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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