Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b34e60a4a792eb…

MALICIOUS

PDF

68.0 KB Created: 2021-03-02 10:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: aed8df5feac260c76e3900fa833890d8 SHA-1: 51c6dca44f54e41b78f0d1c15995bf6c880d87c5 SHA-256: c1b34e60a4a792eb01eb2c71a253ad67c1400ab6b0de1d73e87241de9d2c3e3f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the document is designed to redirect users to potentially harmful content.

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/wix?keyword=arcane+weapon+armor+games PDF link annotation
    • http://freedate18.xyz/comets_asteroids_and_meteors_answers2lc29.pdfIn PDF document text
    • http://my-favshopf.online/perception_in_artificial_intelligence_20201jfyu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420244/normal_6032a8d994872.pdfIn PDF document text
    • http://thepropheticapp.com/free_pre_algebra_worksheets_with_answer_key47ezv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495849/normal_6012128e881ee.pdfIn PDF document text
    • http://grinallex.shop/ionic_3_angular_4_tutorial3468o.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/how_do_i_file_a_legal_color_complaint.pdfIn PDF document text
    • http://elerctum.org/how_do_you_run_a_diagnostic_on_a_whirlpool_gold_series_dishwasherfu7y0.pdfIn PDF document text
    • https://bujubemido.weebly.com/uploads/1/3/0/7/130776032/musadejofewisezos.pdfIn PDF document text
    • https://zaronubiguxade.weebly.com/uploads/1/3/4/6/134685024/8641338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423700/normal_5fe62e8c461a9.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/gazivemon/76299047369.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/ucsb_biology_major_sheet_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/19134660583.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/78832295352.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/utorrent_mac_not_starting.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/bathroom_spacing_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/dural_arteriovenous_malformation_congenital.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/sexapawexalimomunebevapet.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_off0000cf95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF95 5304 bytes
SHA-256: b32f8b97a891f4f409fe7e94a369930423ac57ac4ed9db83d8200b84dfba460d
font_01_sfnt_off0000e19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19D 9840 bytes
SHA-256: 60661cf3b74d001ab9fded6fd224a474829590adf516e5cea47d80115393e0a3

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