Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb53d304cafcbbbd…

MALICIOUS

PDF

71.7 KB Created: 2021-03-27 20:33:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2f6e142d045d2a01d11bf8e2efc0b0e4 SHA-1: c5a370721fa392d9f60816fec491c43a9c28083b SHA-256: bb53d304cafcbbbda03813d80458be6477b90d55f8a7086e3a6845f01f4d118c
184 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML models and ClamAV, and contains numerous embedded links pointing to potentially malicious redirectors and disposable hosting. The document body, though heavily obfuscated, appears to be a lure related to 'Nyla blackbear piano sheet music', suggesting a phishing or scam attempt. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=nyla+blackbear+piano+sheet+music In PDF document text
    • https://forajezar.weebly.com/uploads/1/3/4/1/134108615/zuruzitate.pdfIn PDF document text
    • http://lumogodasekepi.mypressonline.com/ways_to_boost_self_esteem.pdfIn PDF document text
    • https://mewufoxu.weebly.com/uploads/1/3/4/7/134743860/4181066.pdfIn PDF document text
    • http://lifeshop.pro/luxenopejajufrt8hn.pdfIn PDF document text
    • http://lanafobigowo.22web.org/a_thousand_years_instrumental_sheet_music.pdfIn PDF document text
    • https://wukemurorafol.weebly.com/uploads/1/3/4/3/134338373/8d78c7d.pdfIn PDF document text
    • http://it50disconto.pro/relative_clause_worksheet_grade_5fwn57.pdfIn PDF document text
    • http://euromarket.pro/63389290401gvx17.pdfIn PDF document text
    • http://garagodubowixa.iblogger.org/fegad.pdfIn PDF document text
    • https://figalinob.weebly.com/uploads/1/3/1/8/131871825/vunisiserizodelepiwo.pdfIn PDF document text
    • https://rupibofog.weebly.com/uploads/1/3/1/6/131607232/1092784.pdfIn PDF document text
    • http://dashcamtopbest.com/2973999507907e29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijejewilibafux.onlinewebshop.net/wogazuzekufurananinimopig.pdfIn PDF document text
    • http://kagejadel.epizy.com/american_history_quiz_easy.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/aadhaar_enrolment_correction_form.pdfIn PDF document text
    • http://vidoniwofunevan.onlinewebshop.net/bullet_journal_headers.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/the_strangest_secret_earl_nightingale.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/setoxanufoveladadib.pdfIn PDF document text
    • http://merapenerabari.myartsonline.com/how_to_update_golf_buddy_tour.pdfIn PDF document text
    • http://sogaviwezed.rf.gd/lebogepageraxulamobexe.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/audited_balance_sheet_of_infosys_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/bugsplat64._dll_free.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_off0000da32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA32 5448 bytes
SHA-256: 6b8799096bfa81efbac4cee360535c983393c97092c5ef4b90d8630b26193c86
font_01_sfnt_off0000ec99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC99 10740 bytes
SHA-256: 2d3c6fa900aa24f0df08f26c0e015967a98fa576fb518cce4aac34a239f72ba0

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