Malicious PDF — malware analysis report

Static analysis result for SHA-256 29371c17fdba2657…

MALICIOUS

PDF

73.3 KB Created: 2021-09-16 04:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 677e6a519627b5640740d488a00780c4 SHA-1: 369b22bff9f86fce331cb6f582186f073c04c83e SHA-256: 29371c17fdba26575cc694ef2eca55dfaa63e24eb069636a4c2114181354debf
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest a phishing or spam campaign aiming to lure users to potentially malicious sites. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7639

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tdjl.com/uploadfile/file///2021091521502293.pdf In PDF document text
    • http://smartdeal.pl/files/upload/files/91547613113.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/5648195159.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/vulonine.pdfIn PDF document text
    • http://land89.com/ckupload/files/kogidilamaro.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/kedipise.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/95696460717.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/gepuxotelowegitukinazi.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/jejibese.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/giremexogujo.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/94112320407.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb273410c7---falekibajuzuriwinageket.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/bikesazogob.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d63b27e79---xetakojawusevufeb.pdfIn PDF document text
    • http://phulieumaymacbaoco.com/hinhanh_fckeditor/file/56880409568.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/woxevibizegojobobiz.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/luviguzaxezawetolupole.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/mepelobofuwanawijenu.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/78249562556.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/desaperajik.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/63726032580.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/dikedexisezorunujumigasim.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/giguguma.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/38506857153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=boat+java+launcher+apkPDF link annotation
    • 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_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 18472 bytes
SHA-256: 5fc4532835bf727843f774b94b219c2dcd3384a9c75a2b9743ea39d796f9fcfb

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