Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de3c19c0aa2e376…

MALICIOUS

PDF

74.1 KB Created: 2021-02-23 10:16:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 161f19f41387bd26afd39d84c29ab3cc SHA-1: 6a9dbf8a304c734f58c725dd481eb42494e38d0b SHA-256: 1de3c19c0aa2e376b5d5c4748cec3b7d95ef4e72b4b2eec876b2274c62b0dae4
134 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a search result for a book title, suggesting a lure to download further content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links and the document's structure as a link farm point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://druttle.ru/wix?keyword=give+me+liberty+4th+edition+volume+2+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488116/normal_6004cbd3c7947.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486220/normal_6002601645c68.pdfIn PDF document text
    • http://udilische.club/miwifajijejikakozudp78m.pdfIn PDF document text
    • http://slimerecipe.org/73079965498elsni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_601d13c6b35a2.pdfIn PDF document text
    • http://idealica-official.website/how_many_points_to_pass_driving_test_in_texasdfkbk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369659/normal_5ffa26c0d5993.pdfIn PDF document text
    • http://vinorama.fun/supomoxowos2ikug.pdfIn PDF document text
    • http://limons.space/257196167625qpdw.pdfIn PDF document text
    • http://vuxuxabuj.iblogger.org/74670440933.pdfIn PDF document text
    • http://xogezile.66ghz.com/21198550125.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavalinalubov.rf.gd/5798092408.pdfIn PDF document text
    • http://vokunewegulu.epizy.com/information_aurangabad_city_maharashtra.pdfIn PDF document text
    • http://mizixizomafupez.epizy.com/1659439836.pdfIn PDF document text
    • http://zoxutuperovizo.epizy.com/55995119774.pdfIn PDF document text
    • http://wiwekire.epizy.com/business_development_assistant_job_description_template.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_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 5448 bytes
SHA-256: 8a00b32290c50cef46c641abfee287a7170292d0509e870c7623a7f9787dfdce
font_01_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 10108 bytes
SHA-256: 881e931b96c44f8a6e991d0a56234e3b87c9f7d1204f0f806d0be454eae24de5

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