Malicious PDF — malware analysis report

Static analysis result for SHA-256 b90539b0ef8b05a7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-24 06:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9558415bcf09337bb40278e23b11b77 SHA-1: 6ab4deae76e158bb06dbb80ca0447211ee536c17 SHA-256: b90539b0ef8b05a78670a3717c4fd1f04ff344dfcbe5569b164dbcd781f25c85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=descargar+fifa+15+gratis+para+android PDF link annotation
    • https://angel-juicer.com/FileData/ckfinder/files/20210911_9615B7C95CAD0F5B.pdfIn PDF document text
    • http://susutour.com/userfile/file/86613082704.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/7929208820.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/62235063609.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/nixilowijogoxuxezis.pdfIn PDF document text
    • http://araratmebel.ru/img/file/7366608665.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/64341547131.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/79845566772.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8a9b978ee---53631244877.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/23363707222.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd3b5a1aa4---48978079306.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/10448121486.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/megujexudatavoziwe.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/momisefid.pdfIn PDF document text
    • http://topflexsports.com/uploads/56627702775.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091714011873499.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/26550356501.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/kuwinagiwumoboda.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/38423441298.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/22840180798.pdfIn PDF document text
    • https://mollis.rs/files/kofomotasibuvavaxotudiv.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/57874735731.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/besokedubonepesego.pdfIn PDF document text
    • https://nepoo.ro/app/webroot/files/userfiles/files/76940816973.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_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 10936 bytes
SHA-256: 2e3eb7345f7764e9f4895f9d736800428220636a15d5eaa28380f37ed32334c9
font_01_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 20496 bytes
SHA-256: 0bda93cac4d3588de37bd0657cade58fe7a649d77d2f88856e23ef1df2160a9e