Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b421d1d61d108e…

MALICIOUS

PDF

79.5 KB Created: 2021-02-15 11:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8578f18b49d70012de2827ec00b73435 SHA-1: c7356be4970918e05dbaad7ec970e2c79155c346 SHA-256: 44b421d1d61d108eb59e9530c1aa5b3f7f010cedb366903ed92bb4f8a1c0690e
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious intent, likely related to driving traffic to malicious sites or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://bologen.ru/123?utm_term=personajes+del+libro+rebelion+en+la+granja PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457302/normal_5fe9fcf8dd111.pdfIn PDF document text
    • https://bezulagoxirupaz.weebly.com/uploads/1/3/5/3/135347250/timegetefusupelosu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_5fc714205a29a.pdfIn PDF document text
    • https://zetitazafoxiz.weebly.com/uploads/1/3/4/0/134040412/tepegalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417314/normal_5fd989dbdfb7a.pdfIn PDF document text
    • https://peliretoru.weebly.com/uploads/1/3/3/9/133997281/1642c5512a72e.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/tugumeb/javalawimatujorobisi.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/azure_cloud_services_interview_questions_and_answers.pdfIn PDF document text
    • http://rabewifawilowe.epizy.com/sheetrock_gypsum_lay_in_panels.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/84885795388.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/jutowu.pdfIn PDF document text
    • http://ramufezumax.rf.gd/national_cancer_institute_mammography_screening_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/answer_sheet_of_upsc_2019_prelims.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/xss_report_hackerone.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/abn_amro_iban_format.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/ziginawokurabolokazasa.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/nice_guidelines_mental_health_crisis.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/service_engineer_resume_template.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_off0000f609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 5212 bytes
SHA-256: 7910cc62a017e04ddf59bda53712f23ce474c389ffcabdcac40cf0d7db7676cd
font_01_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 11816 bytes
SHA-256: 94cfc62814c4af436d2360f75c3d455b45c7fc863660aea8d10b9bc0a0d95e28

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