Malicious PDF — malware analysis report

Static analysis result for SHA-256 2405d3e956cfaa09…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 19:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a500a64339220922efc5a78a26b53f5 SHA-1: 6c7a6d5f4eee4b932f645c14b9a9c6f34f48196b SHA-256: 2405d3e956cfaa095d9d033911b6b0e01fdab9ece0037c511302dc848392ddc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=most+popular+photo+editor+app+for+android PDF link annotation
    • https://tw-itemaos.com/ckfinder/userfiles/files/25621334199.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/55450807731.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/xesefedodesabaz.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/pobapetowamo.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/rapumexegomonomuzobav.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/tonir.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/48758544810.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/20978503245.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b875e6b579---73377465622.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/26583936562.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/jisoxizulesesodaruviti.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/vijogutisan.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/tumefekodilobifi.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/pufokaleri.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/sabujowobubiviwegojor.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/takunuti.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/kufuxelurebepufusabinutu.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/47195567945.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/13991739234.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/luxinix.pdfIn PDF document text
    • https://dienhoanghean.com/upload/ck/files/73373375082.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/gariwulidogemelegidipesu.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_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 17064 bytes
SHA-256: 02ba569af4b0e39ea3ba5247c60bbd707b1bb3a63c8acb8e6cb3603a837f7b19
font_01_sfnt_off00011765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7C 10688 bytes
SHA-256: 7db974ca89d31b0d4aac9463802a9200cdfa4f96432f83570192989bb2de378d

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