Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f6a9877d78b8ff…

MALICIOUS

PDF

89.7 KB Created: 2021-02-11 05:28:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2690b4554ea58caeedea51cc64aea5b2 SHA-1: d5ad28845e93f0d384f132137c1a090bdce37d71 SHA-256: 09f6a9877d78b8ff706900fb5a74eac9cc20a3695d2efa83e0575f64e573b194
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'free precise language worksheets' and is generated by wkhtmltopdf, suggesting a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jacksth.ru/123?utm_term=free+precise+language+worksheets PDF link annotation
    • https://taxesewisozigif.weebly.com/uploads/1/3/5/3/135394589/dabitilik_gebejurimon.pdfIn PDF document text
    • https://xilasofuvi.weebly.com/uploads/1/3/4/6/134651230/tigopaliwetebu_mikakisarotuw_nulosukez_wonomot.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/5422d0c26154eb2.pdfIn PDF document text
    • https://lefiletigej.weebly.com/uploads/1/3/4/5/134597596/5941937.pdfIn PDF document text
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/govotiwogov.pdfIn PDF document text
    • https://cdn.sqhk.co/kesavaki/VZhaica/yellow_jacket_sting_treatment_tobacco.pdfIn PDF document text
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/gadodokepebikerejelo.pdfIn PDF document text
    • https://tijagure.weebly.com/uploads/1/3/1/3/131398232/vejasasolevilesovaxo.pdfIn PDF document text
    • https://xikofekukinakij.weebly.com/uploads/1/3/2/6/132681309/4ed7fe125.pdfIn PDF document text
    • https://zipelademijup.weebly.com/uploads/1/3/4/0/134017001/4122569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_5fd76c09a04bc.pdfIn PDF document text
    • http://tehnikator.ru/aluminium_sheet_suppliers_in_dubaikq58d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453720/normal_5fe7c7ee8bb55.pdfIn PDF document text
    • http://letxxnx.org/spades_plus_game_rulesnvvzn.pdfIn PDF document text
    • https://matiposokatogu.weebly.com/uploads/1/3/0/7/130739068/telakofiwakijol.pdfIn PDF document text
    • http://idealica-ordina.site/revelation_online_occultist_stats_buildshnmx.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_off00011852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11852 5308 bytes
SHA-256: 8e096fcdc5cd30c6fab5fcfc4de28e6794a8af199cfa64637b0906e4f0f38ffa
font_01_sfnt_off00012a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A70 14508 bytes
SHA-256: ca6419911c1d5e7ff5d5428875df8e9aceb658215c9029e2f6bbe46254f4159d

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