Malicious PDF — malware analysis report

Static analysis result for SHA-256 b742d98aa1a32fab…

MALICIOUS

PDF

77.1 KB Created: 2021-09-27 06:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 68a692aacbd2ba104e84b8523d792887 SHA-1: b7b748483479d7d9ff5c1f643726ae3e0c6ed2ba SHA-256: b742d98aa1a32fab9af7ac27301a8989c7ffc81c6c96806685e02bb5167fa33a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of link farming, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings confirm malicious intent. While no scripts were explicitly extracted, the structure suggests a potential for malicious content delivery or phishing through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://kcpsystem.com/userData/board/file/totavo.pdf In PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/42263716199.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/sibewodetowivezawe.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/4976991819.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/83195827138.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/85934400763.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/14545615016.pdfIn PDF document text
    • http://timebymtm.com/upload/files/34101483209.pdfIn PDF document text
    • http://expresskaliski.info/file/17714078003.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/siropowe.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/roreredavizexarutarijin.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/dalanewoti.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/sepod.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109111414548122.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/1872515799.pdfIn PDF document text
    • https://bauarch.bg/files/41065175321.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/sukuvelarilune.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/kodal.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/bitopigitibukagowefexisek.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614d45d03ee37---43011239644.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/bomavewute.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614950f79a270---sudejivodigewiw.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/sujapirugalavumuxoxulibar.pdfIn PDF document text
    • http://deforma.it/userfiles/files/fetokazafebe.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/gozabaxerepariwibuj.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/penesixanarowip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bhagavad+gita+book+in+gujarati+pdfPDF 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_off0000c2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABB 19424 bytes
SHA-256: 0cbe5378609fc8abeeeb4884a7b7f1a07d34422c413ac49d02ee8ae69896f168
font_02_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 11012 bytes
SHA-256: e2fc26e57cc3931781727817a60a7021862c7f9115086a485e4b302eb6ba8303