Malicious PDF — malware analysis report

Static analysis result for SHA-256 8270423dbb9e5ba0…

MALICIOUS

PDF

67.9 KB Created: 2021-10-05 01:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 82d074ca192c929ce8c763311e3d4f83 SHA-1: 4d3fc68531f385f0a6ac6812c40b2559e5a38bd3 SHA-256: 8270423dbb9e5ba07823f3c86a8be05c45b25e0d461ca583e3dacd524b8d0061
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs suggest a phishing or spam campaign aiming to redirect users to potentially malicious sites. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=square+root+of+120+in+radical+form PDF link annotation
    • https://espritgt.com/userfiles/file/rizipasez.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/mafidulos.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/kujegilowatorogos.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/nujevobotitemojadada.pdfIn PDF document text
    • https://ocw.tw/uploads/files/tufusuwavu.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/kumepegosuzubuxigoko.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/27349256841.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/towozo.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/lanopidewepalatepinikuz.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/memazawegefaz.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/zefujupojabusa.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/buxaki.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/70491146714.pdfIn PDF document text
    • http://cssh.es/img/file/18311694030.pdfIn PDF document text
    • https://branpc.in/ckfinder/userfiles/files/50288365115.pdfIn PDF document text
    • http://chikatere.com/Upload/files/jewegusulafisofizozota.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/defawav.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/90390616074.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/29294838407.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137603e029a9---77170377734.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/wozixa.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/jodasejafoj.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/nexatovinivumaweniwajupit.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/kologovedejaweviwosom.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/86559138694.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_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 11084 bytes
SHA-256: 499b5fe4b84fbaf60c88aff98fd8b948250751a43a53916076d39262be7be1a5
font_01_sfnt_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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