Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b39702f825ae44…

MALICIOUS

PDF

83.1 KB Created: 2021-10-08 00:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 95766261602a720d956d135f45214608 SHA-1: 80f3f917edf1bf94c7ad434e660da1a76d2e48b3 SHA-256: 77b39702f825ae441e063ab7bb0dccae2f6e1fb49cdfd01b1714b05d032b46e3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files on unknown or suspicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using many distinct hosts with few links per host, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://oikoscoccatoarchitettura.com/userfiles/files/kupixodexuxulebixepopime.pdf In PDF document text
    • http://newabel.com/ckfinder/userfiles/files/1596264210.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/2084766269.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/saniganuzipadibu.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/jimaku.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/nukolukukolamixemizuz.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210906153248.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/83148416177.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/71850096623.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/tuxiv.pdfIn PDF document text
    • http://espwireless.net/uploads/file/47343011130.pdfIn PDF document text
    • https://cargotavio.ru/files/file/rotoxugexodigojezinek.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/mexunoxogeribalikixalu.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/67592907264.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/59639461448.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c134553697---pijokubizakekururojojanag.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/xobefamotepolowidabopav.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/64599608454.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/08b3d1e34f07dde4f0178fab3c00f01e/7067445723.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/gavimuxebukiwoju.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/54030832734.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/30461415575.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/21322077934.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/ripabumonamusupumevil.pdfIn PDF document text
    • https://andreivieru.com/ckfinder/userfiles/files/34983112506.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/jaxovikefedorulefib.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/46280495383.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/4662271061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=one+of+us+is+lying+pdf+download+freePDF 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_off0000dc0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0A 10900 bytes
SHA-256: 57b306e5cb97706f34020a04d35f6e98a3238ab6a1d95035a0a7f0657dd2fcf5
font_01_sfnt_off0000f546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 18852 bytes
SHA-256: c12f63232fd0d34b16f9b4affb07a7ec58ea9396c34ada83f28b50558fafb1d0
font_02_sfnt_off00012639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1