Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7ed78375944c66…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 01:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c49d60ff64580fdd1d87f1a9a82a172c SHA-1: 29aa63e7a64e03be9de7aa9e2048670385590500 SHA-256: 0a7ed78375944c66bf8fb40f048dd8353400c941c2eba4d3cc0e2264a8f51afa
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' and the numerous extracted URLs suggest the PDF is part of a campaign to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://vietnamairlinescorp.org/js/ckfinder/userfiles/files/mopij.pdf In PDF document text
    • http://www.awakohchang.com/image/upload/File/838272803.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/vakejojinivi.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/latemizigelid.pdfIn PDF document text
    • http://receptlap.hu/files/kujekitugibedazudorit.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/degumorajavonubexosafiwan.pdfIn PDF document text
    • https://sapsda.org/SapmaUserfiles/file/fuzadofadetesepa.pdfIn PDF document text
    • http://armanetti.com/images/vebumezapixelarubo.pdfIn PDF document text
    • http://momsystem.ru/public/file/89706485489.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/45157793221.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/64594222943.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328b79ae746---53851089394.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/77142254231.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/wotopiz.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210912073502_tlu3re.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210906030605279.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/76450982134.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/dufixa.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/noganadoza.pdfIn PDF document text
    • http://ropesadventure.com/d/files/69373456900.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/m9o7b7t1iulf6k35ef9equ1q7l/44925005909.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/geropevobifapepozijobej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=midsummer+is+full+of+love+watch+onlinePDF 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_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 21024 bytes
SHA-256: bf8d0a63841cf09767d7ad351633e2ad503e111a4a6ef138364389eddde51b6d
font_01_sfnt_off00010f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12758 10988 bytes
SHA-256: 5e54fa6932008aae2cca6eea945252d251abb7c23fff53edf3d5da5ce271bdaf

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