Malicious PDF — malware analysis report

Static analysis result for SHA-256 f279a809616607e5…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 18:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d041c6daab0a0f0082384f36db0ff20f SHA-1: 934760ed815988ad547431c56eddab35aa3fcb8c SHA-256: f279a809616607e51cc96748f099b8634bb988900a16f595e506c23b235b715a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://reaga.net/js/ckfinder/userfiles/files/batuwafotabawimaju.pdf In PDF document text
    • https://newtech-utm.pl/userfiles/file/kinetatesexeraku.pdfIn PDF document text
    • http://stpogfzz.com/attachments/202109/editor/file/webokitupovuwas.pdfIn PDF document text
    • http://hrudolf.com/userfiles/lodaduxuka.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/forugaxeredidupuxawe.pdfIn PDF document text
    • https://limsurempat.com/contents/files/30350750411.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/77917949480.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/76731495704.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/48638628181.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/renusulud.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ed87847fc832426ad2e0900cd97829b9/13576120644.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/xuviso.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/gifugedubureruxobo.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/jivekava.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/75916779752.pdfIn PDF document text
    • http://gojjang.com/uploads/files/89995208782.pdfIn PDF document text
    • http://okvin.org/userfiles/file/75620732116.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/57065483655.pdfIn PDF document text
    • https://akemi.ro/hirek/file/61963573874.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210922_162828.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/43e89521dea9d1b8cbae66105f085909/11430745511.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/jariromavor.pdfIn PDF document text
    • https://ngenadmin2.nextgenphotosolutions-beta.com/app/webroot/files/file/siwomabijod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dungeon+village+2+mod+apkPDF 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_off0000b3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A6 17632 bytes
SHA-256: 4581f7784d0bec23b9629caa556c82ab91185643d34189700ede7e50a988b4bc
font_01_sfnt_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 10748 bytes
SHA-256: e2e327a12850d1a116fffdfa6c4155e02b5e9ff05972e05a8638c8ba6d96c539

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