Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac10dd452b182ed3…

MALICIOUS

PDF

74.8 KB Created: 2021-09-19 05:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2d49f3b23139caa8df3389bfa836b48 SHA-1: 337e02c60b6fce8c1df5bb4813a01683e45a8456 SHA-256: ac10dd452b182ed3ffa0b9ebc39840e99e8c7d6a7ab7a1305aec638013f4e4f5
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. This structure, combined with ClamAV detection and ML classification, strongly suggests a malicious intent to redirect users to potentially harmful content. The presence of external URIs and the link farm heuristic indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7509

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://crysiq.ru/uplcv?utm_term=how+to+get+5+robux+for+free+2020 PDF link annotation
    • http://eatatrudy.com/uploads/files/77981239879.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/vevinatujawexit.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/fesifubajovare.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161400d6d5b106---78253719342.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/73695319922.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/25606453130.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/52056374957.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/63688760323.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/90798097559.pdfIn PDF document text
    • http://anninh247.info/upload/files/lekabibimezap.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/jijimovif.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/68949576622.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210909125241.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/43956122408.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/74341757824.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/51891773157.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/fazebapogusixapofi.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/miwekitupugen.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/lisumigesovotafasu.pdfIn PDF document text
    • http://ccsl.asia/files/bolidukadagobid.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/52143269359.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/vexetibamab.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/364d8f8d3a358252d9376b331bb21c4b/60366312305.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/lobemofanekubileni.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 18216 bytes
SHA-256: 13b6e7bbf866c02d492cfc69932c3e1cec32867ff465680df9d2a1954bd43961

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