Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db4da84c2c833a4…

MALICIOUS

PDF

95.4 KB Created: 2021-03-19 03:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d133243583ef2dddee3f836a3ccf6527 SHA-1: 62bb4fa62549ada5e8a2d16ba594e84357e08e0f SHA-256: 2db4da84c2c833a45f66fb366fefa52011f7fa3c31f441f4476dc8260b7c0e68
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://seumenha.ru/wix?keyword=bustopher+jones+song PDF link annotation
    • http://delayikapy.xyz/gefosexaworamyxtz5.pdfIn PDF document text
    • http://kigurumi.org/hp_officejet_h470_ink_service_module_replacef7n2v.pdfIn PDF document text
    • http://yourdesk.website/43156696483yvy57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_60349c282a358.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/apollo_twin_price_in_pakistandywi0.pdfIn PDF document text
    • http://gnfcns.info/honeywell_wireless_thermostat_not_communicatingks8ul.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/guledoloxured.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/pimufalenopojcvh2r.pdfIn PDF document text
    • http://doridusa.medianewsonline.com/rebejivo.pdfIn PDF document text
    • http://topcabinets.xyz/44656878738cvedk.pdfIn PDF document text
    • http://dakajak.medianewsonline.com/envision_math_grade_6_workbook_answers.pdfIn PDF document text
    • http://brandframeb.com/905732334kiic6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5ff7b80215d1e.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/dikomavomem/87640292435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08e85793-9746-4464-affc-a351bf879c5c/sports_illustrated_magazine_cover_size.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/philips_aquatouch_at610_14_mens_shaver_blades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be48240-f5a9-4e4b-8de4-e8eb8e0d882e/singer_simple_2263_how_to_thread_bobbin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d30cdda7-7018-4a51-a9f3-ae2fc818152b/what_should_be_included_in_a_treasurer_report.pdfIn PDF document text
    • http://zuxokoberibaw.atwebpages.com/sled_driver_brian_shul_download.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_off00013885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13885 4964 bytes
SHA-256: b9026ca07563a8b6a31ef30fa285890a8935b96b2c89af36a82af3d406a33d8a
font_01_sfnt_off00014972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14972 11556 bytes
SHA-256: e9bd79eae4d958f331381fd2aa2064b4361b88b289ae6564aac5a1f749d67b30

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