Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c9a732efe4981e2…

MALICIOUS

PDF

76.0 KB Created: 2021-03-28 11:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8f0678f6906f0c2a98804e6c39914a1c SHA-1: 71d366802ba2c96593da01c938038b5e85aeba67 SHA-256: 4c9a732efe4981e2a5b52ae0d005a039ff4d2688d14cb2383832e08bc3722ab9
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs confirms the attempt to direct users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://soxebez.ru/award?keyword=analise+tecnica+e+fundamentalista+de+a%25C3%25A7%25C3%25B5es+pdf PDF link annotation
    • http://figimumagoko.mygamesonline.org/38210380997.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/77818939982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384045/normal_5ff009c6a52a9.pdfIn PDF document text
    • http://xunetokawetik.sportsontheweb.net/new_testament_apocrypha_more_noncanonical_scriptures.pdfIn PDF document text
    • https://nigixugibozat.weebly.com/uploads/1/3/5/3/135305984/jagemapoxop_pazowapu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384046/normal_5ff65d2e16483.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/handbook_of_capillary_electrophoresis.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/best_website_builder_software.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_6022e661b9bb2.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/benchmarking_in_tqm.pdfIn PDF document text
    • https://gafewifem.weebly.com/uploads/1/3/1/3/131379815/8427439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403684/normal_5fd2fd18c9ef7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5fc7392bc020a.pdfIn PDF document text
    • https://ruloxewetufo.weebly.com/uploads/1/3/1/1/131164393/b2cbf9db707.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://459ec6dd-5b69-4322-a182-74abbfaa0e48.filesusr.com/ugd/221eaa_039ae1751efe44bca222cd098853f222.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_3076eb8a9448441cb7972c2a3034d984.pdf?index=trueIn 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_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 5596 bytes
SHA-256: 0710d79ee8b7010e433bae789d764465428deb8fdf0469f531faf4ad1d5c8c98
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 12428 bytes
SHA-256: 1ae5c9af03272f5c6b15da2218fa50a138cb61f8b763e6588a2ba93464836583

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