Malicious PDF — malware analysis report

Static analysis result for SHA-256 4266ceb2848e1dc3…

MALICIOUS

PDF

72.8 KB Created: 2021-10-03 16:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8c9907f573b80b7ee73f5a242d47dae SHA-1: 868bb1718f8a92a7cad45e409529ff8406910e7d SHA-256: 4266ceb2848e1dc3f1e852e88fd1f858f25532d3689bc2dd9d6da59f7cd04bd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware delivery vehicle. It contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The PDF structure and embedded links are consistent with attempts to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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 http://teamwork-poetschke.com/ckfinder/userfiles/files/75696233071.pdf In PDF document text
    • https://mimpiindah2.com/contents/files/pewiwejilorusenesijolir.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/82669791005.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210903/files/20210903212137.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310024a52c9---76603326248.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/40682489787.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/58671879780.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/noganerasamus.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/23652257616.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/jogofopukudusuda.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/59213730576.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/62667111851.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/pejoxutukisamobopibit.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/javebonoga.pdfIn PDF document text
    • http://flirdining.com/uploads/files/furefisizubotujuk.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/36689867179.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/95029376723.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/femujuveponisebigizafoji.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/62024554450.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/58067235978.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/19112006908.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/bifijibov.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/towagodelikemipetosirili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=linux+bash+if+variable+is+emptyPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48F 18328 bytes
SHA-256: cbd665e3e40b684a1736ad0dff619d2063750bde8b796701137b63f3e3d27ab7
font_01_sfnt_off0000e43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 10984 bytes
SHA-256: 8e066a6e9287d35afa96758b66900881b9dd78090096801be96ca7b799726c27

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