Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3ca8d15f66deba…

MALICIOUS

PDF

66.5 KB Created: 2021-09-26 22:28:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1dfbadc1aa378f55e84bb9f7b128ec39 SHA-1: 634c89231240ea15322bb05dd706fa43edd1dba3 SHA-256: 3b3ca8d15f66debabe5ec9b0d06bf3a6ff1a1b6df2e40ee7ff6ae68b6c834ad2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of link farms on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5231

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://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/xidefarafilodateleka.pdf In PDF document text
    • http://checopharma.com/upload/files/xagafamibugepirote.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/78860390652.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161348aeb8a4ab---90855288741.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/50353688711.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210918153820.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/15212749016.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210902_162423.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/75798938968.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/bazovivururifapijipedofaw.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/24957239869.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/52334422265.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/gagizutop.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139844063d36---53422057468.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/nopopasapobamufas.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/lejofisilidulo.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/pujivexulazefibasonagexu.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/dalefomukaguzon.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/15732242856.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/mujafet.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/godikikirapozibenutapatu.pdfIn PDF document text
    • http://thongthien.vn/upload/files/zigeviwiju.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/9469013751.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/80963694180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=quantum+mechanics+concepts+and+applications+free+pdfPDF 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_off0000bdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E4 18512 bytes
SHA-256: 3b037042875eedead6382bd571497fada4671c4e7dca71d616fbfcd2edd7bf70