Malicious PDF — malware analysis report

Static analysis result for SHA-256 9828f98b4f1cc53f…

MALICIOUS

PDF

71.7 KB Created: 2021-03-10 18:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 569aec40a6b6ad8724b82cf1f3ccfc37 SHA-1: 90f9b353041a548a546cff5284ce3fcb5a27cc7d SHA-256: 9828f98b4f1cc53f20e1da0e20c72a9b4214fb89e7ab01c70a9dc49b34e22b9b
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, suggesting it is designed to direct users to numerous external resources. One of the primary external URIs points to a domain associated with keyword-based lures, specifically 'epidemiologia nutricional pdf'. This indicates a phishing or SEO poisoning attack pattern. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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://kuzutuzo.ru/award?keyword=epidemiologia+nutricional+pdf PDF link annotation
    • https://cdn.sqhk.co/jojevirelo/9Ojcigf/entrepreneurship_and_small_business_management_means.pdfIn PDF document text
    • https://momobamuv.weebly.com/uploads/1/3/2/3/132302987/xobinukub_gikozo_samelakowa_rusobogirax.pdfIn PDF document text
    • https://cdn.sqhk.co/mofipife/hhjaKhh/tasomotolitemenowixef.pdfIn PDF document text
    • https://xowesujitevenas.weebly.com/uploads/1/3/5/3/135321640/8a58ad76d7.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/waxegatulo/how_to_convert_jpg_to_icon_image.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/nasb_super_giant_print_study_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/consultant_report_to_client_example.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/novetid.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/equations_of_lines_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/50605716088.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/12242416930.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_550ab00661c44f3dabe47e32ac3e910e.pdf?index=trueIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_3b2474ff88c9422095ddc2fdcbd926a7.pdf?index=trueIn PDF document text
    • http://tajapog.rf.gd/zasofurit.pdfIn PDF document text
    • http://jasigobup.epizy.com/asset_management_value_chain.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_db08ef96a74141108a7f046dc40db848.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/company_core_data_sheet.pdfIn PDF document text
    • https://1fbc2cdc-0680-4209-8088-04f8f281d9c1.filesusr.com/ugd/3254bf_5f2e1f6f0e64460a99bd5da1d164f017.pdf?index=trueIn 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_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 5252 bytes
SHA-256: 83f182827aa42175f942e4daf4ffd530243ae222c2d22d0690c469baa69d0500
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 10780 bytes
SHA-256: c46f4ad53a04ac9e1ea607bb938a65832de42f61fd282e9620420b86ccb1d36e

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