Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0d1089cdbf0109…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 19:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cf882a71086423d751fc478c792bf83d SHA-1: 613dac08e2ba440df0abc8c8f02c051a4ea0922f SHA-256: 5f0d1089cdbf01097c8f765a7f6a7e86fac252871856dff44c1b22e0f74a4654
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging strongly indicates malicious intent. The numerous links suggest an attempt to distribute malware or conduct phishing by disguising malicious content as legitimate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://donkaew-furniture.com/ckfinder/userfiles/files/puzunanomemuxiwulu.pdf In PDF document text
    • https://rajaunited.com/contents/files/kexibosana.pdfIn PDF document text
    • https://denimder.org/resimler/files/nuzojugisegakakopedube.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090315020935.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/3062870558.pdfIn PDF document text
    • http://sakem.org/userfiles/files/fiwakevu.pdfIn PDF document text
    • http://co-mit.com/uploads/files/vusonud.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/pekilukaluvupabugon.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/76179425919.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/77707428333.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/79801995763.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/disevaxebepotoxoj.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/kenufirunumik.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/mikanim.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/femimedev.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/vamok.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/40661868375.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/zokilomojoserususip.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/46024303282.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/zosak.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/juguvajufizunodaloj.pdfIn PDF document text
    • http://ledins.lv/cms/file/75500715798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+pocket+edition+tablet+downloadPDF 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_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 18536 bytes
SHA-256: 83b6355c5d82ed55f87576bec4fc16187ae56f7a1a7ca6a3d72242909990c267
font_01_sfnt_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B0 10756 bytes
SHA-256: e446989387cd16b78194a1db6c02218ffef8bafc03077132a25a1e62150696f2

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