Malicious PDF — malware analysis report

Static analysis result for SHA-256 809d527802c7b502…

MALICIOUS

PDF

75.0 KB Created: 2021-03-03 17:26:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2a938da7309901d31c486e5be5254ab2 SHA-1: 24f11b6af903048c0d30a89a53d9ffd2b18ea8f1 SHA-256: 809d527802c7b502514eebe8b53a7e7a994aae4ef0f0fc762fa0e989d9a86cb6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

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 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://jumiwimov.ru/123?utm_term=combining+like+terms PDF link annotation
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/mutizujomupa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_603ef42bb76dc.pdfIn PDF document text
    • http://fonujameritules.getenjoyment.net/willy_wonka_and_the_chocolate_factory_movie_clips.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/nenidewojabufadizalun.pdfIn PDF document text
    • https://lujinelux.weebly.com/uploads/1/3/4/3/134361227/cc24ad8.pdfIn PDF document text
    • http://bitcoins-profits.com/27237009128oplf4.pdfIn PDF document text
    • http://bufukaw.iblogger.org/jagefaratikunewepe.pdfIn PDF document text
    • https://sonolinezib.weebly.com/uploads/1/3/0/8/130874018/tuganemobavovu.pdfIn PDF document text
    • http://save50.pro/jotesowofukatujuti334q0.pdfIn PDF document text
    • http://zoo-taxi.site/xonoga0jag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473047/normal_5ff90c18417c1.pdfIn PDF document text
    • http://qqkaxes.xyz/91041461978kqd4g.pdfIn PDF document text
    • http://coolstudent.space/51105829858iddtd.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/67819551546.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bebovufuvuji.myartsonline.com/whats_the_difference_between_plot_and_story.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/dituwogipul.pdfIn PDF document text
    • http://bofiragomux.rf.gd/tokibolujaferedovogoraxif.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_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 4904 bytes
SHA-256: c8dd94ed415c60cfbd933b9617d42b30ceaca12b89641ddc24226f246122a942
font_01_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 9744 bytes
SHA-256: 43b76c64f1bcd9a4fd5d572f5b3180e8b8f6247c54ee0ab04818f87f80b2fc65

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