Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4412b58befcb97…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 08:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b60a4f84397cffba0933992a733dbe85 SHA-1: 4e762c9409579544416498d20afa8b139cadb89d SHA-256: ad4412b58befcb970162491d1cfc01a198d9b4c63ad3c583a30935a80e993060
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured to host numerous links on disposable domains, likely to obscure the true malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or deliver a secondary payload via the embedded JavaScript and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://bursac.net/userfiles/file/65599426928.pdf In PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/71339540294.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/ferituwasajabuzedoteni.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210903005254.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/nabegoliso.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/bizub.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/tuzepa.pdfIn PDF document text
    • https://carlojans.com/cms/file/48292861789.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/54524046335.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/tuzifumosaxipebus.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/16123570606.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/wobawewuponosesokesi.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f50a1c28---tumupemopafero.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/81663271177.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/wopowixotebalatomaginuxu.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/vijumiposofaraluda.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/pazunajafewozovufov.pdfIn PDF document text
    • https://mihalex.by/files/files/25529669161.pdfIn PDF document text
    • http://standdominica.org/files/files/5856083540.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161351b5658b62---28793628440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=vpn+gate+connector+pro+apkPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/6509500271.pdfIn PDF document text
    • 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_off0000bb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD355 19168 bytes
SHA-256: ca7e514fa78a4b3f8e79f3b777252df6644546c0634bd17e7eb1e390a4e49bca
font_02_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 10304 bytes
SHA-256: da022a3036c3543ce48a518b0320e59dd6cd5d5861fc857371dc040b1daa5733

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