Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc60b0e86c3e345…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 09:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f16da68ada383b1931c7775ddc206f2 SHA-1: cc64ad0139e0b3380984c00f956ce2114da538d1 SHA-256: cfc60b0e86c3e34516e0be08158d686347a36256af161a3d50ff15b138dd2387
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs suggest the document is part of a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://lecormier-menuiserie.com/www/upload/files/26284253381.pdf In PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/nufuroliweruw.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/dovujimijafirivunikuban.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/52239421079.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/77618451574.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/56862780689.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/93235703118.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/85411598980.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/ladavivuxefakedawer.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/19713301022.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614073b49cfe4---vuruzesejibujosobasi.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/lagiko.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/12604042355.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/fidipud.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/gusudituwuvujanemikanesu.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/64005683950.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8375d6348a3eafb1ae4998c57d224ff8/72150147067.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/7726444277.pdfIn PDF document text
    • https://partnermind.cz/images/files/62688758797.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/22313245647.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/72087824761.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/48533651959.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/makerezilapuz.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/fevubavapisij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=best+todo+list+app+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_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 17368 bytes
SHA-256: 123ecf2777bd87e34330716cdad3d43c76fcf4375f52f67090a086eb163ac0c9
font_02_sfnt_off000132f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F1 10440 bytes
SHA-256: 2de290b9e6ff3b61164d0eb667c28c408d3bac6278728641a70a881b1e7f27aa