Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d4638f2d679c49…

MALICIOUS

PDF

76.7 KB Created: 2021-02-28 04:03:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0d4dc9c0bea60657e9ad461c428ebd0b SHA-1: 6deac1acc2c09da4b3bbd8ecc981fdc3e383dbee SHA-256: 86d4638f2d679c49dd6f924e303bf5f37209c37f18e717939abaf85b2cd1f92a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing or trojan. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://botokaw.ru/123?utm_term=how+to+teach+reading+to+adhd+students PDF link annotation
    • https://jubekajaduv.weebly.com/uploads/1/3/4/3/134345699/80140b5b15dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_6026e0c6e5b4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426269/normal_6033c777bd7c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_60036be92c092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450438/normal_5fd1993e1dc0c.pdfIn PDF document text
    • http://dasiroxejipi.22web.org/movie_counter_new_punjabi_movie.pdfIn PDF document text
    • http://josebixotarez.22web.org/ipcc_may_2019_exam_date_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369632/normal_5fee453f785c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455197/normal_600cecc71aa91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366377/normal_5fd8d48a06d55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484154/normal_602289e4892e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424361/normal_5fcf3c9f071f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_60216bf756f67.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/fewifuwu/buildsoft_global_estimating.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/ar-15_upper_receiver_length.pdfIn PDF document text
    • http://fefefekarut.epizy.com/crystal_reports_case_statement_multiple_conditions.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/71659051565.pdfIn PDF document text
    • http://vuvimipumas.epizy.com/power_pressure_cooker_xl_10_qt_gasket.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_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 5224 bytes
SHA-256: a56aa95fb2f21cdb60f9634e814a00f81b93b1340c234b7860cd28d3f19b495e
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 10820 bytes
SHA-256: 4005eeef8d42230c011464ba1a2a8a6073601ad49bf24850e3d3be775309e7d7

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