Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c1afa786895e34…

MALICIOUS

PDF

121.7 KB Created: 2020-11-25 19:16:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 96cd46af0a4c86605a876a7e1a2d0735 SHA-1: 61eec5be22803b9b2b87914f03aad6b37afd667b SHA-256: b3c1afa786895e345e7dd04d648a4a6b3462bc0080e7aafebab9aa8b0735684f
214 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded links, with at least one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a link farm or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=best+the+devil+is+a+part+timer+characters In PDF document text
    • https://zemonawajut.weebly.com/uploads/1/3/4/6/134688337/6987684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485801/normal_5fba680d75088.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/5489129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493569/normal_5fb38ee2ab7e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_5f9226217002e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_5fb6b374250f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_5faa649fcdef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_5f94ea6877368.pdfIn PDF document text
    • https://pemopexo.weebly.com/uploads/1/3/4/3/134305592/tosabaxajuzatojok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449602/normal_5fba6c43b6037.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sezebepit/free_printable_banner_template_for_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/408ea326-8f74-4170-acbb-72d525b1d217/gonoleteberapunidatepu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEA 15216 bytes
SHA-256: 577eed051d2e916286fd493eb8d5de0818ab0dd71e10e715bdcd132004dcc980
font_01_sfnt_off00017d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D57 1768 bytes
SHA-256: c588eea8a047fa4eb07f542ba62fadfac9dd8622540312fe82fba6e77ad909b0
font_02_sfnt_off000185d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185D9 5424 bytes
SHA-256: 0d03795f75a1440827a90797efc1bcc9b1c89c09196b856ef8ee9c1a6423b759
font_03_sfnt_off00019826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19826 12536 bytes
SHA-256: 3a0c9f95ed5d07d045994d10a5df76298b01e23bb00d2462bff012f257fd12b4
font_04_sfnt_off0001c166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C166 16204 bytes
SHA-256: 581c0268a3cc9df95828ceb030693f64bcb03969c1cab585f80954d7fb3b146d

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