Malicious PDF — malware analysis report

Static analysis result for SHA-256 8daa56f55dde9182…

MALICIOUS

PDF

82.5 KB Created: 2021-09-21 11:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 895be5ac8cf8bdeb7d30dd865d514471 SHA-1: ed23f767aa6f9c71c78a579a627cf2af29fe5095 SHA-256: 8daa56f55dde9182eb4476c32684c2eb87fc62b7abb5bba03c4c89de3ac13f68
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains hosting other PDF files. This structure is indicative of a link farm designed to obscure the ultimate destination, likely a phishing site or malware download server. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://relaxzenter.com/uploads/files/24466644853.pdf In PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-19/20210919061124168997.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/bukerubixibonagegobopedaj.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/pegevetisexafomuviwupenef.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/21621402944.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/dogesesixul.pdfIn PDF document text
    • http://panova-art.com/files/file/29337145768.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021941221476540.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/66692263319.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/22452818760.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/degutexile.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/05737b3ed87a005a8ad1af0ff926febc/vujez.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/tavewodi.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/48641468017.pdfIn PDF document text
    • https://doitoutdoorz.com/file/7iUIRSWpe8z63axe.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/44121727823.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/donurotoxo.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/11058526283.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/lenafed.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/43617113366.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/14216605158.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/rukixenu.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/nizozosamedugopekeragejiz.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132614fda3d7---kozadanowubu.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/16604200921.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/25705308819.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/jijepeteg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=math+cash+app+hackPDF 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_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 9964 bytes
SHA-256: 0d7a32529b83b07e3ee8c398a0a8bf2f0a9115f42b5195ec60888acff101f5a5
font_01_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 17088 bytes
SHA-256: d7bda4d576c4584a255e602ea6c4b97f1513d72aee63b24315ccfa6fd5cd2d86