Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecd8dccbd32bd74…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 02:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fab63e7a18362c49f8206cd415cb7d90 SHA-1: 7ce4bb208d9730be6c729971854c1a6025c2c4a6 SHA-256: 5ecd8dccbd32bd74eb4dc54b6889c99178608b4bda67231f9ccc01a15275c3bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://drafthe.ru/uplcv?utm_term=linear+bar+graph PDF link annotation
    • http://tortsurprise.ru/upload/redactor/files/57536365171.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/22798562465.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210913153204.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/medumures.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/51980988217.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3d27a200---60966578907.pdfIn PDF document text
    • https://krossi.ru/images/content/files/67793569426.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/sidawagiba.pdfIn PDF document text
    • http://innotack.com/userfiles/files/14989750770.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/84836917522.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/32356457220.pdfIn PDF document text
    • http://calienglish.com/ckfinder/images_store/files/67950879022.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/66244175475.pdfIn PDF document text
    • http://vuason.vn/upload/files/52276525756.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/lafutazojuxijiwekodura.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/buzifojuranita.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/43862067341.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021912526303452.pdfIn PDF document text
    • https://gornjastubica.hr/files/10559726359.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/9324924566.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210901055353.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/xunexitunut.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/95298438269.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/31429094827.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/lomojukibumadewu.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/56053528903.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_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 10196 bytes
SHA-256: c1c81133bb375def1e34c755adb3e38dc0fbb8a996c9f39262188d066cb85ba7
font_01_sfnt_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 17680 bytes
SHA-256: 325821df9c8bcaebbe8a2d815a7767de6e5e2e90ee0af5ba7d5bc3218ab9b910

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