Malicious PDF — malware analysis report

Static analysis result for SHA-256 d567985fabaf943c…

MALICIOUS

PDF

77.5 KB Created: 2021-03-21 06:30:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5e70f8e0610450741122b74c44a835e3 SHA-1: dc901f24f7258ad68e3589337181aa416a28bed3 SHA-256: d567985fabaf943cdc95c8853f516f00902773a6bedd3d4b22072b51628ef7b5
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and an ML classifier. It employs social engineering tactics, including a fake download button and a lure to install a browser extension or update, to trick users into executing malicious content. The document also contains a mass of external links, many hosted on disposable domains, suggesting a link farm or phishing infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a high likelihood of malicious intent, possibly leading to further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 9

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/award?keyword=baixar+pdf+scribd PDF link annotation
    • https://pazopoxe.weebly.com/uploads/1/3/5/2/135293382/1046025.pdfIn PDF document text
    • https://gonibokufelari.weebly.com/uploads/1/3/5/3/135346176/9964112.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/example_math_problems_for_2nd_graders.pdfIn PDF document text
    • https://pimotaro.weebly.com/uploads/1/3/3/9/133986821/8252282.pdfIn PDF document text
    • https://kawavugin.weebly.com/uploads/1/3/0/8/130874435/pawufenevida.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/04210f57e.pdfIn PDF document text
    • https://raxagipob.weebly.com/uploads/1/3/4/8/134883443/6744774.pdfIn PDF document text
    • https://vekosafadowob.weebly.com/uploads/1/3/4/8/134868088/9735521659.pdfIn PDF document text
    • https://biwiporiv.weebly.com/uploads/1/3/4/6/134620494/0e08c66.pdfIn PDF document text
    • http://mynasert.online/difference_between_conditional_block_and_render_variable_in_cognos_report_studioagtkl.pdfIn PDF document text
    • http://zpitanie.ru/dexowetevetofaj1rrb.pdfIn PDF document text
    • http://onlineeshop24.xyz/xbox_cloud_gaming_controller_clipgaz48.pdfIn PDF document text
    • http://gosepakaf.getenjoyment.net/21620588868.pdfIn PDF document text
    • http://idealicaitalia.website/69600298876fnxoo.pdfIn PDF document text
    • https://mofixeridivekux.weebly.com/uploads/1/3/1/6/131606419/16635ee4c1972.pdfIn PDF document text
    • https://jikajulimag.weebly.com/uploads/1/3/4/3/134319013/7255404.pdfIn PDF document text
    • http://hisgohar.site/samsung_32_1080p_hd_smart_tv_un32n53006w9y1.pdfIn PDF document text
    • https://xopilinunerixaw.weebly.com/uploads/1/3/1/3/131380618/kuzifedobavarezow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/boren.pdfIn PDF document text
    • http://muvekalufisu.atwebpages.com/how_to_prime_wagner_paint_sprayer.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/110cc_engine_oil_coolers_for_cars.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/walmart_winter_tires_and_rims.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 5372 bytes
SHA-256: 20e53b0e6eec7e202211b944df98b03254fa6a864ba1dcb6ea509501650630e7
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 11568 bytes
SHA-256: 79bac2206806e76ff7e62f4ecb66257fc9884b6b7841b224702b0abbce67c529

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