Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ac0f9363d9e1d1…

MALICIOUS

PDF

66.5 KB Created: 2021-09-19 15:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a25539208f1f6d06f88c68723b35ee4 SHA-1: 7aa8baf00d1d99b9e0674f1d9498e294068ee569 SHA-256: 39ac0f9363d9e1d131765f28f5207bf3eb3d29b9dead3b056527cb3727b75d8f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting it is used to redirect users to potentially malicious websites. The presence of external URIs and the link farm characteristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9198

Heuristics 4

  • 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.
  • 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 http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/meloxinemutonozuruvatez.pdf
    • http://cabini.it/userfiles/files/80300491030.pdf
    • https://cbdc.co/uploads/ckfinder/userfiles/files/ruzukapipigejimibinaj.pdf
    • http://shrlie.com/upload_fck/file/2021-9-7/20210907060657908085.pdf
    • http://daechienglishpark.com/ckfinder/userfiles/files/ligodulit.pdf
    • http://christ-china.com/filespath/files/20210919194637.pdf
    • http://tuzy.pl/Upload/file/59925591491.pdf
    • http://www.sosonomo.com/ckfinder/userfiles/files/21740694101.pdf
    • http://flamefitnessstudio.com/cewit/images/file/tojazakaludetufipukasojat.pdf
    • http://first-group.kr/ckupload/files/gipuvizunimujule.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/42566487785.pdf
    • http://mcserpenti.com/userfiles/file/12530178017.pdf
    • http://arcomproltd.com/userfiles/file/84083222387.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3e995800---67061885964.pdf
    • http://denkobarbell.com/_upload/files/vilurixeloga.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/45566108363.pdf
    • http://cesarrodarte.com/userfiles/file/69579188440.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd916ce72---89727043949.pdf
    • http://barcelonasixtytwo.com/userfiles/file/69549063494.pdf
    • http://rainhouse.kr/data/editor/file/4929561816142b37ccf213.pdf
    • http://mp-journal.com/media/file/1980045570.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=90+degrees+in+pi
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3d8.bin
83fe89218f77840dd4bee85c89a5e5a70d674695ca0f29fa5e12216e427a5337
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D8 17544 bytes
font_01_sfnt_off0000e0cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 16792 bytes