Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf1c42afe71c369…

MALICIOUS

PDF

89.7 KB Created: 2021-09-10 06:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7c9bb94f8f2b8a9427463c681d4072d SHA-1: a01eb2d049a6b401948d105f8964034a328b1a8d SHA-256: baf1c42afe71c369f7f1a6d7fd17394a765b9686c1fb1c4804b75417d099a44d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://ikkosushi.com/uploads/files/mexokunesa.pdf In PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/tevomazosi.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/dotefe.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613835e27d06d---4885300434.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/mutadajog.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/semefawizoridadeguvaju.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/jusunasuwolugak.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/zujezu.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/fisuginovovako.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/84818237318.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/59822974295.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/29659225342.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/jitubobomewotesiteke.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/masuwuzorimasej.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/9045795545.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/kakelanotox.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/20742930012.pdfIn PDF document text
    • http://coumert.com/images/file/dejifofonegipofedexiwa.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/42689090264.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/garilaj.pdfIn PDF document text
    • https://yuktogel.com/contents/files/nemozigenapebikatelaxi.pdfIn PDF document text
    • https://theipbuzz.com/images/file/42708166453.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/60932807186.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/67e6959a3882da5c0b7207f9d79e9339/zetatuxuxubibu.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/fixirekudolez.pdfIn PDF document text
    • http://abnicum.ru/files/file/zibajovexiwojulisor.pdfIn PDF document text
    • https://qnzar.com/files/77622763845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=player+emulator+androidPDF 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_off0000fbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBA 17536 bytes
SHA-256: 127e40cdfb255322722a4778138e56faddcfa5848c77440adc3ac859b0c9ee45
font_01_sfnt_off000128eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EB 10456 bytes
SHA-256: 4388736349380270600d59a98f86431096552fe3c9c83c972e3b7f3ee98c52cf
font_02_sfnt_off000140a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1