Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17da0beff65be21…

MALICIOUS

PDF

81.1 KB Created: 2021-02-24 16:07:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 747e95d56d12c6915b63a938a0e96efe SHA-1: 87e0d3430e996c45e4b6f635154c763086deac95 SHA-256: f17da0beff65be21e0670cb8c7c2e0520d654255cb79f4d050a17b05dd54d101
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=les+trois+mousquetaires+film+acteurs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5fd64647cc053.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/what_is_grounded_theory_analysis_in_qualitative_research.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/madame_butterfly_book.pdfIn PDF document text
    • https://cdn.sqhk.co/kefexunas/D7iahYD/rowulumivutitumevirub.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/4k47yHj/tevuxa.pdfIn PDF document text
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/3490661.pdfIn PDF document text
    • https://rabuwamefikulo.weebly.com/uploads/1/3/1/3/131398373/733ae2657846c.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/958a5.pdfIn PDF document text
    • https://bikigevoxepasi.weebly.com/uploads/1/3/4/7/134716722/e03947.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462727/normal_5fe220652a9e1.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/jeRjhji/cytus_ii_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474462/normal_5fdc878306979.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bitegovaduxigag.epizy.com/89277893665.pdfIn PDF document text
    • http://fumoparasupob.epizy.com/ligapulifarewuxezuk.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_off0000fbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFA 5096 bytes
SHA-256: 516fe53a5a476eda61a38aa370b9f56c542fde15bbbfda093dc72d3c03aacfc4
font_01_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 13072 bytes
SHA-256: f1f8f8173d576940aed5405f0ea87e40a31a2980eb59c3d8578ad1da36ae2f61

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