Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa3c68e019c5317…

MALICIOUS

PDF

72.5 KB Created: 2021-10-08 03:21:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 381cf46076fbe0f62f2313c80bb5825d SHA-1: a94d6656e3196e7910b2292676d4a4d30c8cb74e SHA-256: 0fa3c68e019c53172ce6f490b2c1e2c7ba68ad56833dcb52489dbad47d8b6cfa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs that act as a link farm, redirecting users to potentially malicious or phishing sites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=directions+to+dinkey+creek PDF link annotation
    • http://consulcongress.it/uploads/assets/file/dinorivesezolitadekitijen.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/80964528416.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/48411196220.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/39103480212.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485e34cd786---21886939919.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/venumefikuduzewakuwena.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021092615015597829.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/figebimizuwube.pdfIn PDF document text
    • http://hadt.vn/upload/files/degoxodezita.pdfIn PDF document text
    • http://hadt.vn/upload/files/69338922271.pdfIn PDF document text
    • https://edgecs.com/documents/xamewilaroromadegifob.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/96748257351.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/13219094894.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/63596766941.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/44399038264.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/34816333473.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/niwafabenam.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/bujujokurev.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16155aa1ddc7db---ruxomonewadu.pdfIn PDF document text
    • http://activesites.atiks.org/files/67935835352.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/kazugeget.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/galobixodizi.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/kijubatogamidemopasa.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_off0000b963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB963 10364 bytes
SHA-256: bf0194784bc8cf0032b427e9a80eecacb71943a4d9273c9e4b5eb26d896159bd
font_01_sfnt_off0000d0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F5 17244 bytes
SHA-256: 092eca2ab115a6c31ece488f0185e0c13bb0e7ea733aa83c490f32ecf36d501c
font_02_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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