Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dc3fcc8cfe4537…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 23:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 54b621e480f82482950d83e2ca84ea45 SHA-1: e58df7d330d7863254e558872bda7ab5d73beffa SHA-256: 54dc3fcc8cfe4537ed244933359de2adf7f88083f023d1e6f0b113840fb10b5d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=teetiny+online+apk PDF link annotation
    • http://top-caster.com/userfiles/file/58094612776.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b7c5aa27---4423882255.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/6247853.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/17912931305.pdfIn PDF document text
    • https://pellevah.com/upload/files/furaxononirutitedivuzelob.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/kuzokad.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/migukikategun.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/jarolisafofiz.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/48391449282.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/nabisinuwofonusosijozag.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/xakajovizet.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/dukanobewedopimuxosepi.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/nemaduberakepe.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/dulumobokiberub.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/1699176010.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/41110567086.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/nozikimofawagafa.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131464c80968---61562747981.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/pudire.pdfIn PDF document text
    • https://geniodelweb.com/file/pusorogif.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/7528084041.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/kegasesojodop.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_off0000d155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD155 10144 bytes
SHA-256: 8245061d4f9774b8062a1ff71e8a81fbcc4fdb9afb8e56d815672aae31add0fb
font_01_sfnt_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 19312 bytes
SHA-256: d7502019858fed01cae96ab9462babf8c3d6fbe55c1677d77bbcb8d3005d6fa3
font_02_sfnt_off00011ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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