Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bd8839ec0cbcaf…

MALICIOUS

PDF

72.3 KB Created: 2021-09-17 12:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aed9f5743f69a13480df5f5ed620b454 SHA-1: 2910e1b0a37d98563a6fefa2d34b5a8bbba3bf75 SHA-256: f7bd8839ec0cbcafcabc89d275e7507622da34889aef29749dbf131897047fb7
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the sample is part of a link farm, suggesting it's designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://flooroverstock.com/admin/userfiles/file/wurijofun.pdf In PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/73406988547.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/64503421491.pdfIn PDF document text
    • https://olterus.info/contents/files/xixokimegovu.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021091117321173499.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/fegebeveru.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0960968ffb1131b3238531ded34ffe69/kajemoda.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614232e34675e---julisuvafafululawelusa.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210914003246.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/76168551471.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/vezujutojolape.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/64471675583.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/fagopewirufopozax.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/54760285175.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/vadiwutafokonan.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210909055403_ngcfua.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/bagadebejokibedumuxun.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/lunuxama.pdfIn PDF document text
    • http://imbirimbir.ru/files/92273551463.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/wubejokepari.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/88976923575.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210903_69AF5B08CC623810.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/desefariganolotokezil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=youtube+app+volume+low+androidPDF 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_off0000b9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A3 10760 bytes
SHA-256: 85085dd6d8060e6ac19b6c57737f325736a6f878d8a7b6aeba7b1ce14b7943fc
font_01_sfnt_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA35 16156 bytes
SHA-256: 89af90b1660e3101dbf092c348c9e40305a63b34f6fa565ee9717bfe8d4a71a5

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