Malicious PDF — malware analysis report

Static analysis result for SHA-256 2898c2ee1ad34674…

MALICIOUS

PDF

64.8 KB Created: 2020-11-25 06:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a959ef256aafbd091b518b0f87221031 SHA-1: 103b9944d412efd717738860f8bf24615f8d0424 SHA-256: 2898c2ee1ad346742f77a9be024a8d23a236a4e3fd3a7ec095750dd7d39b316a
156 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 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://traffine.ru/123?utm_term=the+confident+woman+devotional+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f8d0372c1549.pdfIn PDF document text
    • https://tiluzapibijodok.weebly.com/uploads/1/3/4/2/134265907/1329439.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/suxuzubojut/goxokefagi.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/33761589107.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/livingston_middle_school_staff.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/mass_effect_andromeda_skills_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/pesemigipotibomijifale.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/cfa_level_1_2019_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/moto_x3m_2_unblocked_at_school.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/ielts_academic_speaking_topics_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunoje/half_the_sky_nicholas_kristof_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/physical_chemistry_term_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/jumonava.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/54247937522.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/psat_spring_2019_answers.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_off0000c261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC261 5224 bytes
SHA-256: c23a617487dd96c7656c10d28c4a9da283894f9df087378d79b23094fa933f86
font_01_sfnt_off0000d41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41C 10044 bytes
SHA-256: fd499ba57ed1770bbf259e2e90c3c61ace43929612512522b2b8105fd150f153

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