Malicious PDF — malware analysis report

Static analysis result for SHA-256 527941acbd8dd7b6…

MALICIOUS

PDF

65.2 KB Created: 2021-09-14 06:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4fe04d072139c8d05e578110895680e SHA-1: 91f9378f25d4ebbfc2052e72cd398231e5e8c2d4 SHA-256: 527941acbd8dd7b65656760d0c11270a303172c6b33ab698b734c2c42a322f3e
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9495

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 http://www.niziointerior.pl/upload/file/64446234760.pdf In PDF document text
    • http://dvif.fr/userfiles/file/94594547339.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/sofuselisigepofakimazodus.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/jemepax.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/23263117202.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/49867875385.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210908181138.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137984c450bc---retakikavukixoto.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/boxebexipiki.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/76816998252.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/3531085225.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/40611909729.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c84d6c196a---51979094801.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/32571060203.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/76665887257.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/retosolizevidefubaborenov.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/nonakasolebize.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/dabogavugukijixiruzonoti.pdfIn PDF document text
    • https://zzwgjx.com/d/files/veralovene.pdfIn PDF document text
    • http://airzo.net/userData/board/file/jixofuwebejuwesa.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/pikefupekiwibolisaguxiron.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/webekab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=drifting+simulator+unblockedPDF 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_off0000c31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31A 11152 bytes
SHA-256: 949c4ffe0520013a336f6fe8299054dda607cdae2457143fdbd559043e84dcca
font_01_sfnt_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 17396 bytes
SHA-256: b0f96e2832dea8d5e9b0b233b09795261a0471b6d6423369dbf7a95cff028bd4

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