Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c0e3bc9d8ebe0d…

MALICIOUS

PDF

74.8 KB Created: 2021-02-18 03:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 505291f88ea84ae2f4f2e659b90f7562 SHA-1: c2d05fa68256e8b1baee54d02aa3373050e3bdcc SHA-256: c9c0e3bc9d8ebe0dbe03f20a89b8858ddd4ce8e03e38d0c0911b06cda2d7f103
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crophysi.ru/wix?keyword=maze+runner+newt+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383928/normal_5fd68a3d88e78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449992/normal_602b08a08d982.pdfIn PDF document text
    • https://jojapewabivato.weebly.com/uploads/1/3/1/3/131379205/7188108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485156/normal_5fd2df9992f8d.pdfIn PDF document text
    • https://vefiwuzozubeki.weebly.com/uploads/1/3/0/9/130969791/zolod-fuxevifutorema-gemaxoza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_5fd62d3907062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504791/normal_60221e2e319c0.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/jefuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489598/normal_5ffc261a6e1e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451762/normal_5fe4a5163da55.pdfIn PDF document text
    • https://dibatavuxod.weebly.com/uploads/1/3/0/7/130775672/xalarakasatudir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486751/normal_5ff5b6db3daf8.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/ea6128eaba9.pdfIn PDF document text
    • https://puvixote.weebly.com/uploads/1/3/5/4/135400279/zedoxosanefukosojiz.pdfIn PDF document text
    • https://dukuvelawabuze.weebly.com/uploads/1/3/0/9/130969723/xabubuwes-xibizuri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5fc82635cff80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450747/normal_6021cfbd62478.pdfIn PDF document text
    • https://folenepawesig.weebly.com/uploads/1/3/2/6/132680852/tobevuzigapi_junoguzavavulo_sibexa.pdfIn PDF document text
    • http://kofibilo.22web.org/leyendas_y_rimas_de_becquer_vicens_vives_resumen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tixenolas.epizy.com/engineering_wow_classic_guide.pdfIn PDF document text
    • http://novosumagib.epizy.com/vocational_english_for_nursing.pdfIn PDF document text
    • http://bamasagure.epizy.com/georgia_mandated_reporter_statute.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_off0000ea4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4E 4820 bytes
SHA-256: 62eab435e0a290e3d360cbe634657a2f78ec891a153c0b0e8d55a95fa70b26eb
font_01_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 10088 bytes
SHA-256: 3acbfb03763d3d7df54d4557fb0946ae8e9f08bd3f9c290fee73bc0e9930254c

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