Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b34177cc97f4eb9…

MALICIOUS

PDF

73.0 KB Created: 2021-09-25 23:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a75a4f72393b7a1ce1e2691756b80df8 SHA-1: 8f49830dcf8cea18bcc9b85ab8ad38dedcab2dc2 SHA-256: 8b34177cc97f4eb98129fbbe5f35de9eba3e54aed999eadc6a0bdc47c0d8f70b
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 ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://wixoon.hu/upload/file/vipoxokurogunuxomiwaxigok.pdf In PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/raxelemufovidaz.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/xaximunikuginusesonijavod.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/49371384731.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/96208047049.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/poragad.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/67051865863.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109201804087565.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/zelamug.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/36744821579.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/tiberu.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/63817036873.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/fuxojonobexofinifijidugub.pdfIn PDF document text
    • http://telefoonindex.nl/images/uploads/dodivotiwixunate.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/85086404562.pdfIn PDF document text
    • http://pevak.info/UserFiles/File/bipifebajolevomisamexod.pdfIn PDF document text
    • https://phukienbep.net/media/files/kuziponajakew.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/79462124423.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/jetolexed.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/jejegeferorogo.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/medozebofugusevigimusa.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/girorubivamow.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/texosafomotexejugiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=elven+surnames+and+meaningsPDF 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_off0000b7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00B 18040 bytes
SHA-256: 86d4ea9376382ee1d22bee693edc45a76cdcd303e61deb4aa7ad98cb461084bd
font_02_sfnt_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 10520 bytes
SHA-256: 88095022e1b23159f6113c8a411b8b76fff9770e56bd0c1401b8dc5c7f8d282e

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