Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb02f422f90cf78f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-12 17:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fcf0568001a0a80f5569f7f3055a0f20 SHA-1: 4f99cd9c32175e2b3572a103d8c2387edfd2483f SHA-256: fb02f422f90cf78f2246ab56765fc1faa5f6d362f81d4f69a5f11012081a8213
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://daechienglishpark.com/ckfinder/userfiles/files/97439029061.pdf In PDF document text
    • http://unseretochter.com/images/file/32648619948.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/96859113867.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/sanuvow.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/vazipewawivujarituwej.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/77266771741.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/gomopegofefupow.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/19709109308.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/85168323678.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/32709247786.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/91384030240.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/deremagofuw.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/26409385270.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/danuwazugavepavezo.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/25759807618.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/kimotirazesisadebev.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/84599786924.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/vozuniwibijafuzi.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/80187844663.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/51898316658.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b039251b5d---52487136313.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/vakubidovabaxetudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=upper+body+lower+body+split+workoutPDF 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_off0000cd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 17476 bytes
SHA-256: d4aeabebd565c53c99a71cabb64ae646d70be7b15749c2f863b900c2e38f4a23
font_01_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 10656 bytes
SHA-256: a9d214f06b99e386e3a754450b08afe27697ca60c182120f9f356aabc59f6c6a
font_02_sfnt_off000112e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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