Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efce569d5ea1eb1…

MALICIOUS

PDF

96.5 KB Created: 2021-02-13 16:44:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: cdb0918886426a17f564cff29b30e48f SHA-1: 26b9c3492f5218ffb32f9bf930d9891e9a1ef755 SHA-256: 8efce569d5ea1eb1b2a84a6ac07487ca21ac6394d22e48cea820c3230ba2e948
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an embedded external URI pointing to 'jacksth.ru' suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URI are strong indicators of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=el+si+de+las+ni%25C3%25B1as+resumen+por+actos PDF link annotation
    • http://xrootunited.com/78937183471s0xyi.pdfIn PDF document text
    • http://vykupavto54.ru/conectores_de_consecuencia_en_ingles7n17l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5fcf93a96a59a.pdfIn PDF document text
    • http://uaregroup.com/wedavemobageutg7y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369495/normal_5ff249abd15d0.pdfIn PDF document text
    • https://cdn.sqhk.co/jirowolad/jAiekhc/rapuzutewomadulitiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_60168e2e2756e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479674/normal_5ff9bce69e606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_60175f4dcb590.pdfIn PDF document text
    • http://redirunna.xyz/homeopathic_treatment_for_glioblastoma_multiforme6hopm.pdfIn PDF document text
    • http://christinaanddavid2019.com/mxr_chorus_manualix9e2.pdfIn PDF document text
    • http://bunakevogipo.iblogger.org/tudo_sobre_piscicultura.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/wemupajese/wijomusuvekozeb.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/aluminized_steel_sheet_suppliers_uk.pdfIn PDF document text
    • http://tuxefefili.epizy.com/wimatuboluralasawenabowe.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/zubirekebesivugaweve.pdfIn PDF document text
    • http://getojigukas.epizy.com/android_root_explorer_text_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/fusevimoxiz.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/captioned_performance_liverpool_empire.pdfIn PDF document text
    • http://rinexijirava.rf.gd/boxivunepifibebawedasivu.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_off00013aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA9 5388 bytes
SHA-256: 977c06f61052bc49446258bfcfea1422192832105662100e9a408ad1a8ddc8fe
font_01_sfnt_off00014ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA1 11572 bytes
SHA-256: 84b856c8e0c33c8cb5044cf2074876bb71c1fb11685b6be03f57bfcf3104d608

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