Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb1a886c65f6e51…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 18:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39fff8e5030f59e8ec5e9b81c7091940 SHA-1: c76e2b0e56b9c30e155775cc509b4ab291f0e11f SHA-256: ecb1a886c65f6e519a3bc41c2373a937ef9aa997742c5f9ca84d919e8085e91e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to what appears to be a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://lysfyyy.com/upload/files/35251941207.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372c5b7a67b---98286904966.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/56607194502.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/voralajavutenuperodozobo.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/62627185203.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/96259661842.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1631217586.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/vukovode.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/xotisox.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/65400805645.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/beriretajekofigexorawine.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/35359241711.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/11871874613.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/96420765242.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/27780193422.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/73262688964.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613acbd93d926---kilemafit.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/19697125239.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/nifagizekijazixuxuz.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/2939151557.pdfIn PDF document text
    • http://schokozentrale.de/idata/56230676099.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/tuziwowulurajebexidax.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/89497429712.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/mesejetubidutezedinubi.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/vanipofaran.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=back+button+disappeared+androidPDF 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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 10844 bytes
SHA-256: 0c372dba25816729c73835c153f40108c44efdb8a58fa1613e554cc4c598b35f
font_01_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 18732 bytes
SHA-256: f64dbf01d2b524d91f8b66f324fcce3bf51c5d8d56eed3aa872a7144b90ffca1
font_02_sfnt_off0001273b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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