Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdabbbfe1dd7d01…

MALICIOUS

PDF

79.6 KB Created: 2021-03-10 15:36:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 12a3152c95f8fb718ebb3671699e4b9a SHA-1: 4515a6e1ee8b449a12867bf67d2f6a9ba8be8afa SHA-256: acdabbbfe1dd7d01ec9d89e2309baf39a42776aee7732587f2b8b153b4567d3d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' and associated with a 'link farm' heuristic, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure, likely attempting to redirect the user to a malicious site for further exploitation.

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://jacksth.ru/strik?utm_term=architectural+design+app+ipad PDF link annotation
    • http://vknacruckalaikov123.xyz/sidolitikidisu65z6x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_603449027b92c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469634/normal_5fcf608033414.pdfIn PDF document text
    • http://getbuiss.online/gowojitt5uv5.pdfIn PDF document text
    • https://cdn.sqhk.co/kupibetefuko/ThfgcW6/kedovutoxutiri.pdfIn PDF document text
    • http://artistichomesolutions.com/john_merriman_a_history_of_modern_europe_volume_1kclk7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_5fdc28851fac5.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/jSKnjhl/funny_farm_calendar_2020.pdfIn PDF document text
    • http://idclick.cash/425790347284dyg7.pdfIn PDF document text
    • http://pasanubilop.iblogger.org/pizipaponezutezogisoda.pdfIn PDF document text
    • https://cdn.sqhk.co/xumefugafa/BhcGBOi/bluestone_lane_coffee_hoboken.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/ricvhgb/72033938452.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473359/normal_5fee7d8b056b6.pdfIn PDF document text
    • http://thrivewebs.com/6433280225210n9v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1751e5a7-9b93-44ef-9c80-be32054874a2/fegupilu.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/circus_hd_video_song.pdfIn PDF document text
    • http://jovurafop.epizy.com/fejobawaforu.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/assentamentos_informais_em_mocambique.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/monthly_staff_schedule_template_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a96c7170-d5dd-4bec-beea-5b0239159ab2/vijubedosusebosuku.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_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 5324 bytes
SHA-256: 4cae1dc2c14fa07fdbbab194e30525ec268a0385ec06113a5fe1f27e02251790
font_01_sfnt_off00010b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8F 11068 bytes
SHA-256: 87cf115d6869f5f460a7ffb63818756bb49d1c492d2699aeac1cb770dbc895e1

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