Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4df95d9c590d642…

MALICIOUS

PDF

70.3 KB Created: 2021-10-22 11:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e41b9aabffe199b27e5ab681fa167f75 SHA-1: 85d02028954bfb335dbb271be8962fb98a1f21de SHA-256: a4df95d9c590d64216ab28675059f2d16486b6bc12248d6e71b6e2211542cd2c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7541

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://inwebjor.ru/uplcv?utm_term=ad+physical+therapy+abbreviation PDF link annotation
    • https://tailormade-sales-marketing.com/userfiles/file/77416959161.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7f453819572a81c6d5c16e78572da0b2/tuxomupufujawonifizajo.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/35251355224.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vedupiletatigetawixafaron.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/39828855424.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/xebabuke.pdfIn PDF document text
    • http://askort.pl/Upload/file/29460021520.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/28250536973.pdfIn PDF document text
    • http://ginkgokatsudb.com/uploads/files/56574032072.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_27_19_12_48_9048.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/rizerejumezoxigotuvare.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/7735886864.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/kakodojuti.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109250442208235.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/wenikume.pdfIn PDF document text
    • http://reylab.com/userfiles/file/nufukuxelorukipipogetabu.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/jazivujelopoguxe.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/88935069876.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/65169293751.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/mulabetij.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090609035783.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/97915574708.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/tuwivifupoje.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_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 18440 bytes
SHA-256: e35c24cb36f83054720769e426ef06affe4a558e984c5a38df848284b1211af2

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