Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a60664565236715…

MALICIOUS

PDF

78.1 KB Created: 2021-03-20 10:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac4bdb79c4b7e9836956059371387f87 SHA-1: d062eb5a38ce164ccf8d1cdff1a86f3643af930b SHA-256: 2a60664565236715f80b68af032e6ccc45dd346929bf17c3df16477a9629ec59
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a tactic of redirecting users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=celula+animal+para+dibujar
    • https://cdn-cms.f-static.net/uploads/4497370/normal_603f35d74eefe.pdf
    • https://wepesinojaru.weebly.com/uploads/1/3/2/3/132303052/287d0f4.pdf
    • http://fiwisud.getenjoyment.net/93998526495.pdf
    • http://ketadiets.site/lista_de_verbos_en_ingles_regulares_e_irregulares_completavustf.pdf
    • https://cdn-cms.f-static.net/uploads/4392452/normal_5fd80f92c04e7.pdf
    • https://cdn-cms.f-static.net/uploads/4379221/normal_600be2990be51.pdf
    • https://cdn-cms.f-static.net/uploads/4403818/normal_601cc0ffaaa52.pdf
    • https://cdn.sqhk.co/jebixusugak/janiehe/35123073154.pdf
    • https://cdn-cms.f-static.net/uploads/4450251/normal_6019a1b99f518.pdf
    • http://ziposodepow.mywebcommunity.org/jj_benitez_caballo_de_troya_5.pdf
    • https://cdn-cms.f-static.net/uploads/4422373/normal_603544b8265e9.pdf
    • http://zijafanovidiz.sportsontheweb.net/the_lion_the_witch_and_the_wardrobe_film_2005.pdf
    • http://jigikujed.scienceontheweb.net/java_algorithms_examples.pdf
    • https://cdn.sqhk.co/womafafowix/gekgcgg/jopodipivaxumadinizimisux.pdf
    • http://regsen.website/hey_there_delilah_guitar_sheet_music4d10c.pdf
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/5550054.pdf
    • http://gufutaca3.xyz/govetazelumurukejowiz5ksfd.pdf
    • http://securityverifiedservices.com/descargar_libro_de_yunus_cengel_termodinamicag8tog.pdf
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/70a7854e.pdf
    • http://javaxirivibewi.mygamesonline.org/pezizaxogubo.pdf
    • https://cdn-cms.f-static.net/uploads/4369494/normal_602291dfba43e.pdf
    • https://cdn.sqhk.co/kekelivig/chamjdv/37584734818.pdf
    • https://cdn.sqhk.co/malevevipali/fhj7Phg/country_music_videos_on_directv.pdf
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5ff79c3d911ad.pdf
    • https://jujamepusa.weebly.com/uploads/1/3/2/8/132815903/muvidabulozafo.pdf
    • https://cdn-cms.f-static.net/uploads/4369915/normal_602dfef41e2ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f297.bin
f7c57d807a168bc82d1ab992ee14dcc2bd1578fc34cca4246bcf446042490885		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 5048 bytes
font_01_sfnt_off000103a1.bin
74592cc874c7336da655e66ae4c6477d7b3e43c7ccf8752ae88e30d2cb407188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 11068 bytes

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