Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde17c4c39967a84…

MALICIOUS

PDF

67.6 KB Created: 2021-09-17 17:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df836ab60160b3074b887759a4d8f314 SHA-1: fe121440153449472b6deeeabbed19f336c33b40 SHA-256: bde17c4c39967a844a90812214ea4b2e1bc6f1de6a5cb6a2b343d19472f6fc12
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8881

Heuristics 4

  • 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
  • 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://wastran.ru/uplcv?utm_term=dear+comrade+tamil+movie+download PDF link annotation
    • https://motecx.com/images/file/dabipimeka.pdfIn PDF document text
    • https://emmaushuis.org/pages/21027171682.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/xuxateratejelamamusupi.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/56337519067.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/18286743990.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/zawolabigofero.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/gidufopomoko.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/36786430055.pdfIn PDF document text
    • http://www.77ice.com/upload/files/43476957953.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bezikodutalis.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/sojikodewuverilaxejo.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/musixevo.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210911020328.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-17/20210917075924493731.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/53227949290.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/gebizipunapuxag.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/84019734586.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/leruwavenixiko.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4qhihppgm149mpgmoc4itt07ud/lasipufajopipumibuxolus.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/puseg.pdfIn PDF document text
    • https://energooptima.hu/upload/File/tigukajuridawuma.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/60901587243.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 10516 bytes
SHA-256: 0d5d4421f26e108c231661e629ca6a3602a387917fe137e5f7ce4892c4803332

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