Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe425dcc9f87acb8…

MALICIOUS

PDF

80.1 KB Created: 2021-02-15 19:16:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8406f446b4786d943bfa8c84b9050cbf SHA-1: 637dcfdda0c8370dcb9a46920c7e30c7ca0ee6c9 SHA-256: fe425dcc9f87acb88af3bdc7ce37fb531df7fe843f1fae338dd8aed55bf1bbeb
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. While no scripts were directly extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious sites, aligning with a phishing or content-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/123?utm_term=how+much+is+a+stihl+362 PDF link annotation
    • https://zukikopan.weebly.com/uploads/1/3/0/7/130775822/seniburojudewolal.pdfIn PDF document text
    • https://buvawaxeve.weebly.com/uploads/1/3/0/8/130874113/wuwividef.pdfIn PDF document text
    • https://xinelonaveguv.weebly.com/uploads/1/3/4/6/134606197/regopaluzaru-dubagevelu-xupenitikaf.pdfIn PDF document text
    • http://xitnet.fun/population_actuelle_de_la_republique_democratique_du_congodlizj.pdfIn PDF document text
    • http://soul-felt.com/10293060338ojg8t.pdfIn PDF document text
    • https://cdn.sqhk.co/lofujumixas/WNgiIhi/21123389143.pdfIn PDF document text
    • https://xajerunufunofe.weebly.com/uploads/1/3/1/3/131378991/texikivanujelib.pdfIn PDF document text
    • http://bestrongbyg.com/compare_2_excel_worksheets_for_differencesh9dhn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/adagio_for_strings_tiesto.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/excel_merging_data_from_multiple_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/android_developer_mode_risks.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/sefolomamubelidowusipu.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/android_tv_remote_control_gamepad.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/defebigenuvir.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/anonimo_veneziano_stelvio_cipriani.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/neuraxial_guidelines_anticoagulation.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/evaluate_functions_expressions_khan_academy_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/70864669602.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/dj_baul_songs_._com.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/repadekuj.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 5448 bytes
SHA-256: 35f64d8f05b119e73c25815da252298d2c745f4a3b81a73e266dd43661f9fc81
font_01_sfnt_off00010928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10928 12364 bytes
SHA-256: 001c28bb3015830326650f3432c206c060101b6ce43355fa726cbe4a40f462cf

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