Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88c240b402376f3…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 17:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ec7fdf25030d380eba39453aa8cac96 SHA-1: e28c3473555ca023eeb233c8d508ef63785ff469 SHA-256: d88c240b402376f3ea3a0680907d42af16005033f00d61ef0c680929a077e058
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URIs are embedded, pointing to suspicious domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=my+free+mp4+juice PDF link annotation
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/kurigofidexivinebovomon.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/sopugivegubipu.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/999353195.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/29832884304.pdfIn PDF document text
    • https://e-casainteligenta.ro/userfiles/file/37034781755.pdfIn PDF document text
    • http://lgassociates.in/uploads/60419325982.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/nikew.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/96777221126.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/zupurirekopotofasekotomi.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/52647713924.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109081248315065.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134e54c2e2c2---14672564432.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/64560997657.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/riwewurimufo.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/wonuf.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/39252193309.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/namal.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613516012d841---85921876122.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/vipisifuvumudopu.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/18109807646137ec203da65.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/kufuwunexil.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_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 10360 bytes
SHA-256: eeebe6b1ca9387d994e143553c4ce69300e0bdd5bc0cf6bff2cb444f6eda6677
font_01_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DD 17328 bytes
SHA-256: 416e67ce1d89255018a06430d9a1aa1983533eabdc0fa719d352f0526bae47d8

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