Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98e3ec4f83eea86…

MALICIOUS

PDF

63.8 KB Created: 2021-02-14 05:06:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c450f50fe2231e74f16f109b3bc24b00 SHA-1: 77e539e2040b69ab9961f34be7d0c1cd82067c65 SHA-256: f98e3ec4f83eea86132fafadae488f0d342895999cca755920b3009b2eb9ceb4
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a PDF SEO link farm, with a primary malicious URL pointing to 'jacksth.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

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://jacksth.ru/123?utm_term=845+767+8098 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490542/normal_600a5cd6e7595.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450635/normal_5fee45b8de79e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497688/normal_5fe423697fa1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419644/normal_5ff9c13c886e7.pdfIn PDF document text
    • https://tazegeravi.weebly.com/uploads/1/3/5/3/135390309/wurefigejijipe_kebinakije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382784/normal_6009a050c54fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471096/normal_6016ca058853b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387046/normal_6002135d4a98b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_60140f5f83ec3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472774/normal_5ffe6406ebc67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_600bd1bd2d203.pdfIn PDF document text
    • https://neninilez.weebly.com/uploads/1/3/3/9/133986457/zoziparugofakug_kolib_kigewoxujifa.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/lomiwexuva/ukulele_songs_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/decomposing_partial_fractions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/centrales_termoelctricas_de_biomasa_renovetec.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/9110167976.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/seganigun.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/formation_of_red_blood_cells.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/72984408852.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_off0000bf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3A 5008 bytes
SHA-256: 2c552445064bcf973a7b025d17faa82fdf4be0ee46a461db2e4f9bc0553841cb
font_01_sfnt_off0000d06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06C 10280 bytes
SHA-256: 06fb121569b13acf68a6b35287b9fe437789251d3e71701e863776b111aee646

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