Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1150434fff8b66…

MALICIOUS

PDF

74.1 KB Created: 2021-09-17 08:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 163f95552382a9a6aa4def2b221cb435 SHA-1: 96cb5316080ea37bf67bf2bcc4a8bde6a2085a5a SHA-256: 2c1150434fff8b667e45671f373952ac9c84035ab00089cff49d96033b6a0eb7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://krisoc.ru/uplcv?utm_term=modern+vegan+desserts+pdf PDF link annotation
    • http://investbuild.ru/var/upload/file/wijodil.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/juborafurekawiposixasima.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/66928489235.pdfIn PDF document text
    • https://uangraja.com/contents/files/61880672033.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/89493557949.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/60146003565.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb723b0eab---mixof.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kilinaz.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/jabodamafabelu.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/fobero.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/ludulixafivewetopemerixo.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/gidoliwujidexuguzeran.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/1899379732.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/2242737070.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421d717c158---lusazejirowimikopib.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/23177777294.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210915215648.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/60358823723.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/14517374692.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/43141486889.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/13462657344.pdfIn PDF document text
    • 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_off0000bece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 17184 bytes
SHA-256: 740d3cd4fbac89809cb164119fc8fb20e7bd8486babd66fb76f2396f3bf857d6
font_02_sfnt_off000102f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 10592 bytes
SHA-256: 3bf46b647356e8a7ba3b26f1040359d42bc5bb0d0e5bb654177ce76ed3c10ef8

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