Malicious PDF — malware analysis report

Static analysis result for SHA-256 6944cebb6d9fc0fa…

MALICIOUS

PDF

78.1 KB Created: 2021-10-07 03:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d975bc140cef76ac2aa9dab4c9aabdbe SHA-1: 178364f8ef2cbc8176ea11d0a5ce8da96362cf37 SHA-256: 6944cebb6d9fc0fa7ac44058d9a4de9d287c69da70e9d8bd96ae3088d8550431
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to external PDF files hosted on various domains, suggesting an attempt to redirect users to potentially malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6525

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 http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/5802072804.pdf In PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/64539611363.pdfIn PDF document text
    • http://drdj.friend-match.com/upload/files/84462052394.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/91480617300.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614188629ef58---17011135425.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/42391651920.pdfIn PDF document text
    • http://kes.org/upload/editor/files/3511361088.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/bagulinilumedama.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/xusili.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/pasikogezisigekonepa.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/pupakutudemages.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/sadegerenafobum.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/kibesotupi.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/gunawajazu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146905177f98---gefibazupenopukelupuvipus.pdfIn PDF document text
    • https://chilepools.com/contents/files/60183190362.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/83837559725.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/95508977287.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7820232b8---boxoximetilu.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/wasetamexiloledaxedaso.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/75017417534.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/36837202012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=american+political+systemPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 10632 bytes
SHA-256: 17aa0975175014ad0dc67767402a39444761a89da472071e7eb36d5662a5d639
font_01_sfnt_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 19088 bytes
SHA-256: 5a39729ccbf72c8157f493e8424391b410f7cffda4f2ad72522ba5180f0166fe