Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d6b9de579d7d35…

MALICIOUS

PDF

86.6 KB Created: 2021-09-21 02:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a341c19504211829c4aecbccb24b8c93 SHA-1: 161d461bb3f16769f02495a0c59c61af40112578 SHA-256: e8d6b9de579d7d351c25d22f1960c3f35073a36785fe4cd8e81c5b638addd1f0
126 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a deliberate attempt to create a link farm on disposable hosting, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ratosatu.com/contents/files/4140719957.pdf In PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/dotefarufemifofusob.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/f222334e89381fef426af67841e72820/bagubodarejar.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161403cc6e07d0---68942540952.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/72256553810.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/zobabifimifebakig.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/4373700629.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/72820404403.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/88746790151.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/wuxagifawefagod.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/68452899465.pdfIn PDF document text
    • https://yellowstonewildlife.com/dorenatufijawap.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/nexinowuzedufuloxejez.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/puwir.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/gofixaxiwekod.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/fakurolutugolidewalanoxem.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/xuzibetemafarakekabazogis.pdfIn PDF document text
    • http://nincity.de/inline/file/49098235452.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/73982191482.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210905230457.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/mulaziwugijigilekijo.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/99390687229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vocal+training+app+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_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 18180 bytes
SHA-256: 6701987bca931cfd165e7cb4536eb6c23e2f5c1bc86f9d2c7541a5659bdb2d54
font_01_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13580 10360 bytes
SHA-256: 158e4a39b2248b669e2e89fe307914962096e960d7723490974defd308939fa9

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