Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f48612e6c90a999…

MALICIOUS

PDF

69.6 KB Created: 2021-02-06 21:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0820a95651c0a0c23a838322cb5144cc SHA-1: 4b5ca83e6fcbabda02bf6865409f6c34a246216c SHA-256: 3f48612e6c90a9991fb752af5f36d814473297ef7e7d9a4bac08ca9421202f39
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm designed to host multiple malicious PDFs, with one specific URL identified as a potential entry point. The presence of numerous external URIs and the document's structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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://jacksth.ru/aws?utm_term=dungeons+and+dragons+character+sheet+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417992/normal_5fdbcf4c78db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_601e23189fa7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387240/normal_6013321ef2ba9.pdfIn PDF document text
    • http://mattelipsticks.site/download_cheat_mad_dragon_defenseufheh.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/ciDpFGD/54318590083.pdfIn PDF document text
    • http://ilkertr.shop/norton_antivirus_free_software_windows_7nhkko.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/Liija6k/nemupopa.pdfIn PDF document text
    • http://tokigarodam.22web.org/2014_chevrolet_ss_manual_transmission.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/9hjPiaD/tap_knife_vip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_5fe6258dc2638.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469351/normal_5fe631fc9369f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5ffa11162ea76.pdfIn PDF document text
    • http://pay-order.info/palmistry_in_hindi_with_picturesa6wb6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sisuraregimu.rf.gd/bexojilirov.pdfIn PDF document text
    • http://vujofif.epizy.com/comparative_adjectives_worksheet_year_1.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 5256 bytes
SHA-256: 4bf27232a1b4b9f377285beb21669048955bf32dc660884f668cc72c04c39eae