Malicious PDF — malware analysis report

Static analysis result for SHA-256 685222a725507592…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 18:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a981eb66b62d199621b7c2d27ecca7a SHA-1: 7566c12abf0a63d4c13c8966e0b025534869f4f6 SHA-256: 685222a725507592cf2701e928969ec11618039c3b46ff28658b1c281476f85b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it functions as a lure for phishing or to download further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using link farms on disposable hosting, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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=best+windows+file+explorer PDF link annotation
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305eafb9f5b---kirilixafajagepewugesitep.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/87107611311.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/dabijolutibabageki.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109110230369711.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/repafosigoza.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/70956110797.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/99792575281.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4daf17f2b---15775141306.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/lejegudivuzazakofos.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210902111345644.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/lekajoxemujaperiwuvab.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/3589902060.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/37476255450.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/bobefewonasexazar.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/98964028129.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/vafiri.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/26941539683.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/jatopat.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/kakokobimewobisezux.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630594641.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/genotijowitifavux.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/35757914485.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_off0000d231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD231 17836 bytes
SHA-256: 6c87f8e752cc185c5434eb2d30ea8be3ba16e3a83a53ea9ed6415e1784b6f4ed
font_01_sfnt_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 10572 bytes
SHA-256: f065beb0772b19eb08a6b59772aebf4a5b38b90fff7dd00df3f8e2c9b3ee96a4

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