Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1aa93d034436790…

MALICIOUS

PDF

74.8 KB Created: 2021-03-16 21:07:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0387455aad2fe00d451085a19202fd3 SHA-1: 1776d69fe4c7a9552cf49fb5fc4368b866e6e2de SHA-256: f1aa93d0344367906c229f1464a4e9a01484b76939c1acce3040f8807210622e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=analyzing+data+worksheet+cow+growth+rates
    • https://cdn.sqhk.co/menasimax/jhjjvMv/1990_boy_bands_uk.pdf
    • https://cdn.sqhk.co/lexijunibul/jgJTgf2/red_ball_tunnel_rush.pdf
    • https://cdn.sqhk.co/kupuruvew/bqghasV/vokesolasanisimunofobod.pdf
    • https://cdn.sqhk.co/zejegure/h5llkVY/11771335007.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pusori/59975233379.pdf
    • https://s3.amazonaws.com/pulujolatepuv/basic_rental_agreement_form.pdf
    • https://s3.amazonaws.com/warapagefasovi/kefejitekomenitodefe.pdf
    • https://s3.amazonaws.com/dedinavesute/11665536129.pdf
    • https://s3.amazonaws.com/bulolimepol/kawifevagusegeg.pdf
    • https://s3.amazonaws.com/toniseligiwuzux/89506534483.pdf
    • https://s3.amazonaws.com/nefomojuwet/98494248493.pdf
    • https://s3.amazonaws.com/midizaxopazeji/53889429496.pdf
    • https://s3.amazonaws.com/xiwevitox/zesukafububenubido.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/select_medical_holdings_corporation_annual_report.pdf
    • https://s3.amazonaws.com/purixifusipelid/what_are_iep_goals.pdf
    • https://s3.amazonaws.com/wixamupelinere/single_letter_code_for_amino_acids.pdf
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_22909711b62646d59042f0afc4480499.pdf?index=true
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_3e602f1687824d42890cfcb3e17e1310.pdf?index=true
    • https://s3.amazonaws.com/godewumazek/adding_fractions_whole_numbers_worksheets.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e781.bin
1f646d8a19cd40c77e33a31c617c203b8c0cef9561267497bf181f09f10a2773		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE781 5500 bytes
font_01_sfnt_off0000fa52.bin
040ceb4dc6cb81206680b7583d3ae0dca3dab1ef84c780c11d126fa976a0285f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 10472 bytes

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