Malicious PDF — malware analysis report

Static analysis result for SHA-256 b924b65c549eb8f4…

MALICIOUS

PDF

74.2 KB Created: 2021-03-27 22:34:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 954d8c999f3b48631f7be5949691a5c6 SHA-1: 4129cc384937dfee71e8b8e6fafac9bffb49f444 SHA-256: b924b65c549eb8f4caac0a0d3e146ea9ed0fe36b105604afc5dfcf4f32d0e97c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to 'kuzutuzo.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest this document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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/aws?utm_term=kenmore+elite+washer+troubleshooting+water+leak PDF link annotation
    • http://xigotazuwal.iblogger.org/billie_jean_guitar_tabs.pdfIn PDF document text
    • https://bufopavebusi.weebly.com/uploads/1/3/4/8/134853568/1310913.pdfIn PDF document text
    • https://janafapaxe.weebly.com/uploads/1/3/1/6/131606835/7f206bb03102f51.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/political_effects_of_globalization.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/food_cost_formula_in_hotels.pdfIn PDF document text
    • https://kopomitesukov.weebly.com/uploads/1/3/1/4/131453216/bodoz.pdfIn PDF document text
    • https://bajupeboxima.weebly.com/uploads/1/3/5/3/135327322/wunofexo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://godosuluto.myartsonline.com/grade_12_english_textbook_sri_lanka.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/bihar_police_constable_syllabus_2019_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45a34628-1c4c-4019-b2d3-3ab022b147ee/spacemaker_xl1800_f3_error.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/81337123746.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/69897762989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1650291c-1bc1-4765-bf5e-9c646b7964c4/46308774070.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/kufefalo.pdfIn PDF document text
    • http://kezitiw.epizy.com/23565361526.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/jungle_bouncer_fisher_price.pdfIn PDF document text
    • http://pikaderobiw.atwebpages.com/how_to_connect_my_apple_laptop_to_a_projector.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_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 5364 bytes
SHA-256: 7aa632d79952c310b83032975eafbd90cf3718da66203dc2492020aca5e83ebb
font_01_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 11060 bytes
SHA-256: 94bf8304058419462adf76793fd83c3a3c9802c08b8d3a3677b2be5c0ec89da6

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