Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f64429503678bb9…

MALICIOUS

PDF

65.8 KB Created: 2021-02-28 10:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8a0929af73914f7fb6bc417fa320208e SHA-1: a0fbd1827755fa4256c657a994619c110575f958 SHA-256: 0f64429503678bb9db04976721eb08160a1e6b38b809254baf1dd561f2abb630
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, designed to redirect users to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interaction to navigate 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/wix?keyword=lop+hoc+vui+nhon+tap+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469850/normal_6025f890d6cfe.pdfIn PDF document text
    • https://vatopefo.weebly.com/uploads/1/3/1/3/131398509/f31efeaee57de74.pdfIn PDF document text
    • https://bazeliwelari.weebly.com/uploads/1/3/1/8/131857734/pamixurob_dibebat.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/c67c11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495055/normal_6004bcfde4f79.pdfIn PDF document text
    • https://sajozigita.weebly.com/uploads/1/3/0/8/130814351/nexaba.pdfIn PDF document text
    • https://rusaxexuratibu.weebly.com/uploads/1/3/2/6/132680860/luvenufuvavokabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468831/normal_5fe74d79d2da7.pdfIn PDF document text
    • https://juwujumatel.weebly.com/uploads/1/3/4/0/134042908/runulobuxoka.pdfIn PDF document text
    • https://zipegudedore.weebly.com/uploads/1/3/1/6/131636753/1318577.pdfIn PDF document text
    • https://rupasofo.weebly.com/uploads/1/3/4/8/134892789/kafugimulezofe_xudaxejis_wofurisubewe_vibovelukimo.pdfIn PDF document text
    • https://pudesuvake.weebly.com/uploads/1/3/0/9/130969082/lulenazizos.pdfIn PDF document text
    • https://nuvafuriwevejuf.weebly.com/uploads/1/3/2/8/132814848/jeguf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_6012fe7677a6f.pdfIn PDF document text
    • http://smeshnoykir.space/goxasutowrtoi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevijefe.rf.gd/guide_to_twitch_streaming_ps4.pdfIn PDF document text
    • http://zirivog.rf.gd/the_detox_miracle_sourcebook_book_depository.pdfIn PDF document text
    • http://sibexelopuni.epizy.com/commandos_2_game_free_full_version.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_off0000c76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76B 4848 bytes
SHA-256: 041d454a4779121247fd247a3af6e8a4d96261997f491afe1ba1a750c6ffe16a
font_01_sfnt_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 10076 bytes
SHA-256: 458777b96379be73fd6baff367d85ecc544bc469b20a88382260ec94e5cdd203

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