Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ad1f1e67036fea…

MALICIOUS

PDF

85.9 KB Created: 2021-09-11 02:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: db51657010696f07867431d8583c1047 SHA-1: a4c12106451c534b20aa9829a26e9617f4853966 SHA-256: 76ad1f1e67036fead44f3ba77be36ce76174fa891d9927545989a5713cc111f3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a large number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://audyt.rowerowaszkola.pl/imgturysta/files/xawumomijakudulovi.pdf In PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/xupusijov.pdfIn PDF document text
    • http://skisun.it/userfiles/files/bigobudafivaxakepegora.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/16681415918.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/60616961473.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/75098261592.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/84672615761.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/nolisitibokoguvab.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/6952026942.pdfIn PDF document text
    • https://isosklo.cz/uploads/bixedefekudi.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/debizutugubudonipu.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/34399686442.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/csn1jqkck71ml6lkh41eh5mmr2/gimoja.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/nakebuginepajom.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16133b6e4c4c60---jebajiwalanojaxefade.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/lurupuzolilagufuxud.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/84547937521.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/138533825.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/zaluk.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/talefowukuje.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/54879289921.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/2854775737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=smallest+country+in+the+world+on+mapPDF 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_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 11156 bytes
SHA-256: 4d23a50538cc783a21bc8bed009e6944d5b7deeabb2c4b5d136d1db6093073a4
font_02_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 18056 bytes
SHA-256: 623ac6514541d336df198b6dece190d4e78c9dbff9d7343f284b7603f52d1edf

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