Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cb58384cbe805b…

MALICIOUS

PDF

77.2 KB Created: 2021-04-04 15:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 72fe5748d3918e8a0181d79cf2026db3 SHA-1: 8a25a1376ef0f2290cc24334b4d6b8771f65f414 SHA-256: b4cb58384cbe805b1ae380cb765186ab0e42f7009ba9df7bedfb252df26b8463
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • 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://nipisod.ru/strik?utm_term=can+the+prime+minister+be+a+catholic PDF link annotation
    • http://leaninrzpd.site/punesozegiperixuvotibop16w4z.pdfIn PDF document text
    • https://kiwakamumosa.weebly.com/uploads/1/3/5/9/135963193/c392154af0c389e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446762/normal_60159bbd901ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449001/normal_5fcc692ac7799.pdfIn PDF document text
    • https://sipinawuzukefo.weebly.com/uploads/1/3/1/4/131410227/zigokezefawolipuw.pdfIn PDF document text
    • http://laketofetujeso.medianewsonline.com/69334423632.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/15142309734.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445557/normal_5fcd1c2d6c390.pdfIn PDF document text
    • https://vusipesokos.weebly.com/uploads/1/3/4/5/134585271/5087003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_600ae6d62fda9.pdfIn PDF document text
    • http://delaem-sami.online/34812055835q7dq8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_60107a13650d9.pdfIn PDF document text
    • http://gudutisiluzew.mypressonline.com/26267814833.pdfIn PDF document text
    • https://romenazojojeles.weebly.com/uploads/1/3/0/7/130775884/3393219.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/lazesej/31079695651.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/el_pequeo_vampiro_y_el_paciente_misterioso.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/ms_word_for_mac_2011_updates.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/how_to_factory_reset_foscam_fi8910w.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/13391301739.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/hero_4_silver_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/79672863796.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/base_plate_design_spreadsheet_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/gummy_bear_science_experiment.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/46045328298.pdfIn PDF document text
    • http://wuxosalilujaza.atwebpages.com/hindu_calendar_2020_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/blue_coat_sixth_form_application.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 5220 bytes
SHA-256: 90e1fea130fd225e408e8102f2ca840c1196c1bce8d0692d08d8d0545d8cbcda
font_01_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 11444 bytes
SHA-256: 4428040a46606b1f0c25673dda249633c4f5e860a7fbd51a816f397690ff1bd2

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