Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27bc78c01bf8ebd…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 17:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e78714ec815706930a448df010e783f SHA-1: da386e8fe6585bd6aa20a5f60499990d785a11f3 SHA-256: d27bc78c01bf8ebda0839da4ac8385c70cd0ea0a5ac6e027f909eb1c21d0c13a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF's structure and the presence of external links are consistent with phishing or malware distribution campaigns, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://stjconsulting.it/userfiles/files/12342057181.pdf In PDF document text
    • http://lamardaegu.com/upfile/user/file/rerud.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/wuxifatat.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/lidog.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/91755156955.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f00cad292b---65530755797.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/muxixep.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/dijab.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/labun.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/galakukakidebanusel.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/tepodisexutilefujizidobe.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613711b8516f3---55748715061.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/tifetugijizewasodep.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/mereminegiwokiwimowen.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/jozufefesisukonafasajoti.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/14057606173.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/78186868323.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/53860761538.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/mogino.pdfIn PDF document text
    • http://3sdent.com/upload/files/rilunakosan.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/tatemasozumenej.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/jovedutejipadenexiberum.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/zujonala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=studies+in+conflict+and+terrorism+pdfPDF 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_off0000d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64C 17288 bytes
SHA-256: 15b73512f8bf11413d603f698f51cd0fb6d83fb3d9b0600c94384ae22ad340c3
font_01_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 10956 bytes
SHA-256: c1b99d03989eaabe2ddd1bccb7ad9029aed7069d1828f1811106a2830393fd1c

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