Malicious PDF — malware analysis report

Static analysis result for SHA-256 403010b471c00f3e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 09:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d32604b779da86c7432e0e0cf439a886 SHA-1: 7f663f4e33eb5fbd05e2f164f9f8048d0d38af46 SHA-256: 403010b471c00f3ef1ef563eb169c3e9715953b1d27a2ea9ab57274b9148fd0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan distribution vehicle. It contains numerous embedded URLs, many pointing to PDFs hosted on various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://confeccionesruiz.cl/UserFiles/File/filibegunakunobigesar.pdf In PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/pixotolanewamu.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/73166823616.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/21756316041.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/wanenoniwewinudosedobolu.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/15908380013.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/75607390759.pdfIn PDF document text
    • http://inica.org/files/file///biwinudopedelawakez.pdfIn PDF document text
    • http://kotolantopeni.cz/file/96037961458.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/zozigadudowinatuvav.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/gufurikofepixojixuwe.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/82642104080.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/witibodopupufewuwiba.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/89744791324.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/guvax.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/aba3634c062dd6b76a4d57a2ae54957d/28643499048.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/78521876865.pdfIn PDF document text
    • http://17njl.com/userfiles/files/rugorobuz.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/pebesamowuluzofumutod.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/bawabatinafuzonakexo.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/gebesudekufabuzegejeve.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/lalowexixoxasim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+scan+a+barcode+on+my+iphone+11PDF 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_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 17560 bytes
SHA-256: 26a4c0655bd6f5a471b8a2f9db2c82bd3bf2574d84ff8225a3c36c4ff89556d1
font_02_sfnt_off00012380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12380 11016 bytes
SHA-256: eb70c390b44717d66d1b78ab3b4cb03b6985995cf2bddd9c76f17804d5941ebd

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