Malicious PDF — malware analysis report

Static analysis result for SHA-256 5726fdc7bca215b5…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 19:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7bb105c8b9dc184f3efb1a419016a0b SHA-1: a145a99c6e9e6682eab9992f6c408d223541db32 SHA-256: 5726fdc7bca215b50926059cbab4146a8d9b5be1497c66800b2931b16557f8df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with a spearphishing attachment used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=chor+denge+mp3+download PDF link annotation
    • https://vantainoidia.vn/ci/userfiles/files/tuzisazit.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/dazunu.pdfIn PDF document text
    • http://belovosushi.ru/files/rifadukasusunilogagujef.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210908_112855.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210902134346135321044.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/dedumopalinavo.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/devakike.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/94546488433.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210906051318537392475.pdfIn PDF document text
    • http://www.siposferenc.hu/html/bavisuletarozezuxowak.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/xutur.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/57922697084.pdfIn PDF document text
    • http://turatabor.hu/media/jarid.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/42118149055.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e390d0c877---73841209894.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/venaz.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gefoxewafasuz.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/zizosu.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b59517d4a---12000987294.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/fibanegufasagur.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/923038517.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/timabupalobosuxufaneg.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/debiwunujubudesezuxu.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/18380485760.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_off0000c630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 10772 bytes
SHA-256: 6cabf2bc0ec780228d8d33cf7b8dca55f214a6843d0378d6e7a940895a754596
font_02_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 20248 bytes
SHA-256: 4c5b7c6d0fbd4f02f401f2400c246ad1a006943bfd6d8beae501b11c9ebbb055

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