Malicious PDF — malware analysis report

Static analysis result for SHA-256 3886fc0af586378b…

MALICIOUS

PDF

72.7 KB Created: 2021-04-21 08:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5d9b9fa2290c30c952f281c4e9f9fa0a SHA-1: b24be41dbfbcf774f83eddc35db44bddf08d90c3 SHA-256: 3886fc0af586378be5bc8958d1dac2ca3f493c5e46bb8c9ad692010b7f898e00
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=what%2527s+coming+to+disney%252B+in+january+2021 PDF link annotation
    • https://litunuvojiv.weebly.com/uploads/1/3/0/9/130969221/kupidigomega.pdfIn PDF document text
    • http://birixuxewazotaz.mywebcommunity.org/advantages_of_debit_card.pdfIn PDF document text
    • http://soxezujep.iblogger.org/difference_between_systematic_risk_and_unsystematic_risk.pdfIn PDF document text
    • http://rerokofige.iblogger.org/arabic_letters_book.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/hQhjhaD/jojomuwexopixixa.pdfIn PDF document text
    • https://kopigipovivon.weebly.com/uploads/1/3/1/4/131484029/561de587e.pdfIn PDF document text
    • http://fabikaj.iblogger.org/idol_gu_result_marksheet_2014.pdfIn PDF document text
    • http://fojukivijivik.medianewsonline.com/jojidigidavipelobapose.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/hzjiAih/38500351843.pdfIn PDF document text
    • https://kinotadi.weebly.com/uploads/1/3/1/6/131606109/nopuku.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/ib8jiie/gekosibutopupolisavapa.pdfIn PDF document text
    • https://cdn.sqhk.co/neratimo/hbsQRjf/19547068074.pdfIn PDF document text
    • http://zekaxezixil.medianewsonline.com/fifisamiderum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://riveminigokoxa.myartsonline.com/gitedafufinopusegakowi.pdfIn PDF document text
    • http://bezexus.rf.gd/the_waverly_school_calendar.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/avon_catalogo_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/masked_singer_lion_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/krishnar_basir_sur.pdfIn PDF document text
    • http://ligulukeril.epizy.com/king_edward_vi_handsworth_school_ofsted_report.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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 5872 bytes
SHA-256: 2a84d7bf4900e532a32eb7f47e8915379decee5d89097cdaca239e093daa0b8b
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 11260 bytes
SHA-256: 4912c696c0d577fffce476ef5076a5bf81f4b5f6247b932a380621dc3765a43b

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