Malicious PDF — malware analysis report

Static analysis result for SHA-256 6904c45ff7d96802…

MALICIOUS

PDF

73.0 KB Created: 2021-09-10 21:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac21efed9a9151c6120479b0e4761544 SHA-1: bd5c07d35ef492da2a36b58871996b4963f74721 SHA-256: 6904c45ff7d96802964c0a6ebe1e4bb084e17d6355a0fee2eea5dcd182ffdd7c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the PDF suggests it was delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://sochi-polyana.com/ckfinder/userfiles/files/25510183654.pdf In PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/vovitutoxurusofizo.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/buberedogokupub.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/8034943584.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/madevojowuvobisomawi.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/5618626884.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/binefokik.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/28340838902.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/gulowikemirewaxo.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/wanaregodevurakaga.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/95716191882.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/rugikegogiridimuno.pdfIn PDF document text
    • http://mariancozma.com/_user/file/kemulipunujaxupuwitaluf.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/fukepogotuf.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/rerewelet.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613073a25579a---2729678783.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/zesidewirena.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/17514786374.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/fixila.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/76959795989.pdfIn PDF document text
    • http://school15-tyumen.ru/f/53007020715.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/83384276220.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613925362c455---roxavawavagiwasim.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/lododibiladuvupa.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/3596803788.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/13537996540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ghd+sports+apk+latest+downloadPDF 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_off0000bd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD532 15824 bytes
SHA-256: 5dae8a575df7450f753d86b13da50521d35b77edf1b0830a3347946dc1984b89
font_02_sfnt_off0000fd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5F 10616 bytes
SHA-256: 3725a66ecaee1079b5d8f13060e83fc3ab7c4783cc972bf1ced537bfa1408d1b