Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cde17f11fc59a9f…

MALICIOUS

PDF

78.2 KB Created: 2021-03-15 05:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4d5aac8c5cf8f527ed83f229d5f8db9b SHA-1: db4f928247beca82f148ef2614608f6f4298640b SHA-256: 7cde17f11fc59a9fa0dac391787ddf701760be4022a9fad50592479eb5866b9d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://botokaw.ru/strik?utm_term=catherine+ponder+pdf+portugues PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380230/normal_604e62a9106fb.pdfIn PDF document text
    • http://fowaxulop.iblogger.org/cset_physical_education_subtest_1_study_guide.pdfIn PDF document text
    • https://siwelizotelet.weebly.com/uploads/1/3/1/4/131437983/feluraromanur.pdfIn PDF document text
    • https://xofebigile.weebly.com/uploads/1/3/0/7/130739964/796697.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473053/normal_5fc9f0d25c079.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411681/normal_5ffa077b42daa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_6011460dcb72e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484114/normal_6002c2a21372f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502175/normal_5feeeeb9be4e3.pdfIn PDF document text
    • https://wufodosutitivo.weebly.com/uploads/1/3/0/7/130739718/5e21813fff7e84.pdfIn PDF document text
    • https://tetufimaburovi.weebly.com/uploads/1/3/4/0/134098130/sewifofagujugotaw.pdfIn PDF document text
    • https://gurovepulebeguj.weebly.com/uploads/1/3/1/1/131163897/wejazirifur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479905/normal_600f3c36712a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368486/normal_5fcf5e598cf45.pdfIn PDF document text
    • http://duboxol.iblogger.org/99469077635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_602963b9f22f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475215/normal_600456101923c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498345/normal_5fc8779ecd0ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://godemesefiw.epizy.com/multiplication_worksheets_grade_4_100_problems.pdfIn PDF document text
    • http://fakeloj.rf.gd/mastering_biology_chapter_30_answers.pdfIn PDF document text
    • http://mawafomixo.rf.gd/where_is_purgatory_in_the_catholic_bible.pdfIn PDF document text
    • http://fuvojofud.epizy.com/el_anarquista.pdfIn PDF document text
    • http://fasujenijasezos.rf.gd/attached_herewith_is_my_application_form.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_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 5176 bytes
SHA-256: 6c00e946c475c32f7fa3e18b6a32b0baa66e0a621db0232f20f7583a0dc1e801
font_01_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 11452 bytes
SHA-256: ac6bc84e06f9af8f43bb676a17328df1ed1ee98bc331ab4b7090f2cad26f525e

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