Malicious PDF — malware analysis report

Static analysis result for SHA-256 20241c08c146a516…

MALICIOUS

PDF

70.1 KB Created: 2021-10-01 16:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e268d4b6917b83f2d9039dd14bf89c08 SHA-1: 1b7232f4106d9911df094989777f607824979691 SHA-256: 20241c08c146a5167ee57906a45eefd3b436ceda92e1423efe8d23a17e6cc0b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant heuristic indicating it functions as a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=how+to+recover+mobile+data+after+factory+reset PDF link annotation
    • https://larioenergy.net/uploads/file/sudozogutut.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/mavoraralugisinirigidaru.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/24678765393.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/62124263691.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/56549862448.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/79257824587.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/82718086861.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/29104439353.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/72394188483.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/biwulimuzibojaboloma.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/20494048859.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/35859425981.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/pizejeluwagizurevubazip.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/65810353416.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/32536321728.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613c63a9378f4---10815628044.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/zixitapixiripa.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/zoridevag.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/mejevevapivupaxovud.pdfIn PDF document text
    • https://magatek.com/documents/file/94838548493.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/93494239014.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/72197292549.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/vegalugajoxon.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/3685880700.pdfIn PDF document text
    • 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_off0000b06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06A 15996 bytes
SHA-256: 15a57fcf3440b9bfaa7c73a25ea0b8508c05f287d6a347e08b760aa4a1ff3081
font_01_sfnt_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 10928 bytes
SHA-256: 56b52dc51f62d33a5a24f8b66110b07ed9af8ad0bdf484a253d58c5fbc52fb4e
font_02_sfnt_off0000f276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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