Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf5edcbefac7b97…

MALICIOUS

PDF

67.3 KB Created: 2021-09-21 17:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 98d4f97384d5c0e170852c4c95ad20df SHA-1: 500e176215e706b29440235a99175278b1b78223 SHA-256: bcf5edcbefac7b972676e1fa2cd48a4c580370ae8275ce23d7ec774c63180356
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links to disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://abwhopewell.com/uploads/files/87098596614.pdf In PDF document text
    • https://regiefranchet.fr/userfiles/files/panewaxukizejimewalifa.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/digomexi.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/74812501220.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631963039.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/vupuwesolo.pdfIn PDF document text
    • http://ailizia.com/userfiles/13429631921.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/31552741804.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ae63d5e8d7cc8ba97819b9078d652deb/tufosejos.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/mosibe.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/pifofi.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/vawonimanafovaxig.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/wofilo.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/1b5ce842e104089040308c1c8da59a14/75972273220.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/tazusotalosutokilij.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/33342903901.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/81560655927.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/manitijipiwewuzepen.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/43096665508.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/baridufosanol.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/dodabemesizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=application+to+download+movies+on+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAACA 14280 bytes
SHA-256: c3af2df427438b31e319e449c84681ecf72af4dfc3d208c94d092054028eb292
font_01_sfnt_off0000ce88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 10808 bytes
SHA-256: c5a95bc1cac6c30881062eb455f61a7f92ab7cc1071a8c138c7de1a9c7f6297b

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