Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24aff8985ecbd97…

MALICIOUS

PDF

75.7 KB Created: 2021-02-22 12:35:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: af097ea3562e08f59c8afd83c7347a30 SHA-1: 724710e50e0da2693d8f3d92a59931c4b2649921 SHA-256: e24aff8985ecbd972b611fb868cfd832ec3452595c7aa2ed94d7f48abc54a5ee
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 by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One such URL, https://baarspo.ru/strik?utm_term=eat+26+test+espa%25C3%25B1ol, is directly referenced. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure suggests a malicious link farm.

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://baarspo.ru/strik?utm_term=eat+26+test+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/piwewupovo/jjgZpgc/infinity_loop_game.pdfIn PDF document text
    • http://allrecipes.pro/jukileuh015.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/jbqjchK/7096696923.pdfIn PDF document text
    • https://valefeka.weebly.com/uploads/1/3/5/3/135345526/seriropuzitomikilit.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/hg1Xid0/physics_class_9_chapter_1_motion_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/gifnjji/vefufugijexo.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/jieuQic/19109832672.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/NicohdB/84006100530.pdfIn PDF document text
    • https://fitijozis.weebly.com/uploads/1/3/4/3/134372299/foxisofegitag.pdfIn PDF document text
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/faposaruwunori_mexorudovog_xisakusagurene_wirupeninud.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/gdWgfjh/66929533297.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/lesowipos_jarojonetoji_dawovirusuzab_pizokim.pdfIn PDF document text
    • https://cdn.sqhk.co/nozujeraguje/icid8oy/10352325506.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/wijPhfn/nadovukepowe.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/fedure/bangla_font_avro_keyboard.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/55818127635.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/dd_tiles_3d_print.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/92810935064.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/vidmate_app_latest_version_for.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_off0000e6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 5172 bytes
SHA-256: 01abfacf3d97f776e9915385e4a9a87b849f9434364e2ca62f312d00508ddfb4
font_01_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 12016 bytes
SHA-256: 8fc8b559251e7a67ce6d269405b66213b0cfd57d9cba0dcac753e11829a3bc54

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