Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a6da2169ddd996…

MALICIOUS

PDF

80.0 KB Created: 2021-04-04 02:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 61aa9ca759fd508bc3e1e9efb428a159 SHA-1: 23587c3cd5f5ba71b2c1b96bf29c50ad027670d9 SHA-256: d8a6da2169ddd9965f1887390c631e914eab153537a6e77abd77f2b0659a8eae
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the link farm heuristic point towards an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=what+does+it+mean+when+your+ps4+ejects+the+disc+by+itself PDF link annotation
    • https://cdn.sqhk.co/letarezetap/BgfBgji/jidetur.pdfIn PDF document text
    • https://cdn.sqhk.co/jezumasulej/fNheJji/vimejirutesozixiv.pdfIn PDF document text
    • https://cdn.sqhk.co/kenixidoxexi/kNjaiiv/ata_medullary_thyroid_cancer_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/ketifoseja/hDhchay/gerafumiju.pdfIn PDF document text
    • http://topcreditcheck.info/swimming_pool_sand_filter_valvev85hv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414864/normal_601c5cdeb39d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420432/normal_603ede0422e69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_6068ef0faa8c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_60617613d3bac.pdfIn PDF document text
    • http://storeeu.info/toradol_davis_drug_guideczwmh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412767/normal_601bbb3acfbb2.pdfIn PDF document text
    • http://prizinsta365.site/96100550216hvotg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453103/normal_60431fefb2d18.pdfIn PDF document text
    • https://cdn.sqhk.co/bevizewo/dgfDMgh/lego_duplo_world.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_6010dc1272d17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_601ae2817bd43.pdfIn PDF document text
    • http://successinyourlif.website/66741524787miei5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486778/normal_5ff772a86c876.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457014/normal_5fcebbc12b8f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461219/normal_6001012188560.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475741/normal_600120b192a88.pdfIn PDF document text
    • http://vehicleusains.com/att_remote_will_not_turn_off_tvweic9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422631/normal_5fe997cbc8b6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_6057f21932c34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_6064f269014a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481280/normal_602f297de9717.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 5904 bytes
SHA-256: b01aec06d36431be1cb3b0b5b35dae31a3e8d8903ae249444c70237c16a7a25b
font_01_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 10308 bytes
SHA-256: d844ef45728ea080ea8c258eec1c9a0256d2d43074b221ce3a1ab75f21460053

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