Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f08fac895a54dc0…

MALICIOUS

PDF

68.2 KB Created: 2021-10-03 10:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 80c805495289ef738183aee595b70b3e SHA-1: c488f97d3be6b1222eafa32d8d1f85794426f4ce SHA-256: 9f08fac895a54dc0fda15c2e2c374a62591420b044630a44346e555123ddb00c
134 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 indicates the PDF is part of a link farm, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites via the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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
  • 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 https://thehideawayresortpattaya.com/userfiles/files/56470710236.pdf In PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/nerevirapematixikepev.pdfIn PDF document text
    • http://taxfreepoint.com/file/rikuz.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/18512552813.pdfIn PDF document text
    • http://khocabien.com/uploads/files/mawukomegudesejor.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/19934193467.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/84367314123.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/64828374664.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/34873353673.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/pegur.pdfIn PDF document text
    • http://uco-kampen.com/media/files/nubojolemaninedojijal.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc10e14e20---mefisorawopizeru.pdfIn PDF document text
    • http://surausa.com/uploads/files/rafuv.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9d13865f---fumisirimobozak.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/jejikabipolawuvanotu.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/godewibezufatarogosi.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/61373914386.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/62333540035.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/68101139202.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/97930793564.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/simorufodesa.pdfIn PDF document text
    • https://shidoremicrosys.com/media/luvixidolejopeba.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/vukovowawimodakizajedarax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+determine+the+number+of+proton+electron+and+neutronPDF 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_off0000ad92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD92 11036 bytes
SHA-256: 6a977f3baeba1e30bf7e746c1a0839ccd42216e98138435e278273590f9fe394
font_01_sfnt_off0000c6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ded3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED3 14480 bytes
SHA-256: c29fda11adfffd7f8e2848e6af20f42d11675c8cc97b56ffd062aa904f21d39e

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