Malicious PDF — malware analysis report

Static analysis result for SHA-256 929c9c394e29d474…

MALICIOUS

PDF

93.9 KB Created: 2021-09-18 21:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d15d20daa6036154505d325df850295 SHA-1: f259de5837e0fbb7f46d349a0ad6b0d8066668eb SHA-256: 929c9c394e29d4742a98f8eed9584d690e437d413ab9bf3a169ca17d86b60435
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of a link farm with numerous disposable hosts and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to redirect users to potentially malicious sites. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://domplus.su/userfiles/files/20530217240.pdf In PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/87133146257.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/93643795186.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/91205391648.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/minoburedexu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16139459ddede8---tenonixuzujusatodokumi.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/91932187227.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/ledugosuvisamoviv.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1631369284546488389.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/xajoselesasarevukov.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7sftce5vmdu0eb000n1sfl674c/29206663363.pdfIn PDF document text
    • https://grup-rul.ro/printuri-fi/files/78160478600.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/rixasafizuvosubuji.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/leviwifelela.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/tabudamuxomelupekiroru.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/potedubidevixelo.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/68866827008.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/zapomulepev.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/63812499288.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/84798373057.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/70239810049.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/bugupokagudaxugobazapa.pdfIn PDF document text
    • https://clinicscrm.com/img/files/lamimelotajubuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=zig+zag+keith+sawyer+pdfPDF 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_off00010a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4B 10824 bytes
SHA-256: 40b84163de8ff92fad454cd23c917a2e5ca5477a7a60eb73044c5895f0b1b95e
font_01_sfnt_off00012358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6A 17996 bytes
SHA-256: 6d95c6ed1090716abc4acb9514f0c37e04b8236a3255a920975784d66302f843

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