Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80fd1e39d73fcaa…

MALICIOUS

PDF

59.5 KB Created: 2021-02-20 05:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c4dd149af6276d60679b2d13976fbf00 SHA-1: c6e963bf0747c3f654c1a52a87c1a5a16f1b2443 SHA-256: d80fd1e39d73fcaa2695ce5e161f2ea32e86d0f6d37e1b9fdfd351800260164b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs and links to disposable hosting, suggesting a phishing or link-farming operation. The document body, though truncated, appears to be a lure related to educational materials, likely to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/wix?keyword=inference+or+observation+worksheet PDF link annotation
    • http://jotijitod.66ghz.com/accountancy_class_12_question_paper_2017.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/1475842.pdfIn PDF document text
    • http://xajoraxi.22web.org/fundamentals_of_financial_accounting_concepts.pdfIn PDF document text
    • https://tewamuwomipatus.weebly.com/uploads/1/3/0/9/130969874/tiluker.pdfIn PDF document text
    • http://xikizolux.22web.org/character_analysis_worksheet_the_crucible.pdfIn PDF document text
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/25482f80bb1d.pdfIn PDF document text
    • https://fazolusafiwef.weebly.com/uploads/1/3/4/5/134585025/joxajewi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496816/normal_5fc7bf2e8a906.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://miduzusajaveg.rf.gd/xavufibegimisevuz.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/wijujoxoxeremosemepaleb.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_off0000b04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04D 5232 bytes
SHA-256: ea3463d83abfe56d4938f8246eff323c8cca3ffef1c2d0d2e6d4fe1db0544f0f
font_01_sfnt_off0000c231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC231 9100 bytes
SHA-256: 9cd422d1b3b00f171c620a0111b66949a2c6e035cda3279428c6d4648d1f799a

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