Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc8dc065c409eb71…

MALICIOUS

PDF

72.1 KB Created: 2021-09-23 11:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c70a7fd152b7af505ae36ff66051a344 SHA-1: 5e961bb5602d877b4c27d7c18f6e1e94b6203661 SHA-256: cc8dc065c409eb7103a273d976d05623db56b27a70f56801228db2aeebfa8e7a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with many pointing to disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mbbs.hr/files/55296428353.pdf In PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/75580764939.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/88608737029.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/popesefan.pdfIn PDF document text
    • http://www.puhito.hu/uploads/fovubuwiw.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/wadutiruxifipofipakegugit.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/xezimi.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/fodesisebuvawinej.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/71038634312.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/97698090985.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/larolokus.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/97566401203.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/lobupuximilorotavib.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a47cfa9fb2---32587071489.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/75926504319.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/vewunixamakodowedenubup.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/kegepunesugatumejowigatun.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/womosugu.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/negadisizokinuxafutemaje.pdfIn PDF document text
    • http://rcot.by/pics/files/68454720882.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/37212906836.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/gexigotekejamosu.pdfIn PDF document text
    • http://robedecreateur.com/img/files/97561370633.pdfIn PDF document text
    • http://webhoctot.com/app/webroot/uploads/files/18480750445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=korean+swear+words+listPDF 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_off0000b698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB698 10320 bytes
SHA-256: 351d59e512447af1d3d84e571647866bd88514cfe039ce79eaa6b4de4f1ceb9b
font_01_sfnt_off0000cdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFB 17632 bytes
SHA-256: 614b7cca1c11604793770321c9a3197f6fbdb3288b22ba60a111ac761658b4a1
font_02_sfnt_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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