Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbe2504800abd5a…

MALICIOUS

PDF

75.6 KB Created: 2021-09-12 04:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f77ee819416121db558a32aae8c737ce SHA-1: ea15c1fc4999e7dd76fe10150abba0e7dc207d93 SHA-256: 2fbe2504800abd5a96b2a208d82c6395df57b4856feb14c44e3eaab7c9bb59db
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, including one identified as a link farm, suggests an attempt to direct the user to malicious or phishing websites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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 http://artgraf24.pl/userfiles/file/86683590569.pdf In PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/mepavagugaponuremato.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/toguwarojaxazado.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/35316804154.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/kakebej.pdfIn PDF document text
    • https://bor-diing.com/upload/files/46325628710.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/jopibupoliruguwasebe.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/sikelosokow.pdfIn PDF document text
    • http://smirna.pl/files/file/sikolidatizavisuxabunuxin.pdfIn PDF document text
    • http://crm333.com/documentos/file/89317564844.pdfIn PDF document text
    • http://spakimthi.com/upload/files/zolozubo.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/35482062678.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/74336155870.pdfIn PDF document text
    • http://a899.net/userfiles/file/rezanisuvunib.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/jositabujapixavomog.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/wadixugorufugekokagusuriz.pdfIn PDF document text
    • http://edallyshop.com/upload/files/nefaf.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/dabumilij.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/tunulipedezijefadunixem.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/74753063637.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/66998636702.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/79b9bece599d7abf3d5d845426fb01c3/banukijifuvurumowunirim.pdfIn PDF document text
    • http://mq-water.net/upload/tefevikawebozuv.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/35637374037.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/5483987662.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/kuganawuwezuforosamuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tyler+perry+marriage+counselor+play+123moviesPDF 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_off0000c230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 16816 bytes
SHA-256: 48242223bb4204795fcfe035100d5805a0227f698a71afa6e146abd3b22a8d7a
font_02_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 11204 bytes
SHA-256: df4c0967f493d8270c74f33c1edd0b6c5189c2ca052e3be66368a359c8dd0bde