Malicious PDF — malware analysis report

Static analysis result for SHA-256 325804f2e7158631…

MALICIOUS

PDF

63.7 KB Created: 2021-09-09 02:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8a4bf104381ab3c36590f5e820368a6d SHA-1: 6be6c12cc86622b44e2859432f00c98a1ec7bd8b SHA-256: 325804f2e7158631c779513b680408e22b37bd252da21206b93c0165bd724e60
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm. This structure, combined with ClamAV detection and ML classification, strongly suggests a phishing or malware distribution attempt. The presence of external URIs and the link farm heuristic indicate that the document's primary purpose is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=galaxy+q+android PDF link annotation
    • http://tantusmarina.com/UserFiles/file/383012201.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/74758811.pdfIn PDF document text
    • https://angkalaris.com/contents/files/fofebupifojuluvupuxoro.pdfIn PDF document text
    • https://remini.hu/userfiles/file/47506687409.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/2535816208.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/14673250937.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/4637479545.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/sepenulevuwaf.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/mebofirubisi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161335a655b90c---terubotebobo.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/pebudu.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/buwax.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/67897723858.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/76805809170.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202108311935301335.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/25901313961.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/fuwus.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/xawejujatatoxe.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/gumibimuratunufumefoda.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/15745253924.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/sezonufijufujadaf.pdfIn PDF document text
    • https://domilot.com/uploader/files/90475021460.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/ketubo.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_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1