Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa9b9a365789cfc…

MALICIOUS

PDF

86.8 KB Created: 2021-09-09 22:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7836d544ea8a54e9a2593cc4196044aa SHA-1: ae995b68614c8f903447c61b8596e7dc96a4ff0c SHA-256: 1fa9b9a365789cfc6391feb09b9ae12448491136a76dcf35ccdd617fc01622ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and a high ML score, indicating malicious intent. The presence of a link farm and numerous embedded URLs suggests an attempt to redirect users to external malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the overall structure points to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://gulfb2b.com/userfiles/file/89652078815.pdf In PDF document text
    • http://veszpremkosar.hu/_user/file/zugowepajuxosujirilara.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/falugorasidagagavijejivu.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/27759696964.pdfIn PDF document text
    • https://denimder.org/resimler/files/zibip.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/nukijud.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367d3776409---zivinitijisal.pdfIn PDF document text
    • http://e-sheremet.com/img/zujigidisakatipikuxi.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/tizopasanuvudeguvepopuk.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/85916088195.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/75615244075.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/witukin.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/xufevedimoroz.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305c8dca2a9---11382780131.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/sifujerodemifikunozuzes.pdfIn PDF document text
    • http://aprt1day.ru/file/jagifexenexibirugujozi.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/bufudosoruwodisimege.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/gikaxugimufisoja.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/31391077457.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/mutinenadili.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/70440014220.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/65368295574.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/juzepowasafuwujedorufifel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=snooker+apps+for+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_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 17848 bytes
SHA-256: eb6c62815df32d10c1261387fb4406b2bf4c5a094eccd10a6e5752fb4bcd3ea7
font_02_sfnt_off000135a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A3 10516 bytes
SHA-256: 59cff4b560572522966492cec6176c628268e98651a61f0e7445c4f37546f117