Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dd60e4c9525967…

MALICIOUS

PDF

85.0 KB Created: 2021-05-09 09:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef007ba04488137e86b82aa59c664f1b SHA-1: 9846912d27d7732f155dba022657d1dc397afbb2 SHA-256: 63dd60e4c952596799d8e62a575b2132c445dad6707afa7f6cd98fb4e1f7a139
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a domain that appears to be used for malicious redirects or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to educational materials to entice users to click on the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=saxon+math+course+3+cumulative+test+pdf
    • https://static.s123-cdn-static.com/uploads/4455669/normal_5fc586f2cd2a2.pdf
    • https://gijopufiri.weebly.com/uploads/1/3/1/3/131384250/548cb7b7a21ce2e.pdf
    • http://jajuviramigawo.medianewsonline.com/errores_innatos_del_metabolismo_de_proteinas.pdf
    • http://jatolobigiwu.22web.org/xivabewajagelepimu.pdf
    • http://dazesejep.iblogger.org/vukuka.pdf
    • http://bio-ita.fun/nukajudiboputovejoxesime63wkm.pdf
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5fcc94c55ba23.pdf
    • http://ubzvp.com/ga-600-15_gypsum_fire_resistance_design_manual_21st_edition4bpnp.pdf
    • https://cdn-cms.f-static.net/uploads/4375203/normal_6057e965b348b.pdf
    • http://leporabev.mywebcommunity.org/tipos_de_plan_de_alojamiento.pdf
    • http://xawowonulop.22web.org/company_logos_and_taglines_quiz.pdf
    • http://jawunefuda.mygamesonline.org/historia_del_neoliberalismo.pdf
    • http://bozidik.22web.org/tutosejubojagemo.pdf
    • http://nebatomefov.scienceontheweb.net/descargar_calendario_2020.pdf
    • https://static.s123-cdn-static.com/uploads/4421051/normal_5fed764f794f2.pdf
    • https://gilawidukawopux.weebly.com/uploads/1/3/2/7/132741225/kadizabo.pdf
    • https://subusigigug.weebly.com/uploads/1/3/5/3/135316146/8141167.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://beritoka.rf.gd/democracy_and_civic_education.pdf
    • http://seretavezoduriz.onlinewebshop.net/base_de_dados_2.pdf
    • http://jazupizewatabal.epizy.com/calgary_zoo_map.pdf
    • http://tirinito.epizy.com/sda_hymnal_apk.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f95c.bin
15638a1b33b7a11bd4ce171f1295534824ecf64938607d448c6223f97ba5eb96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 5788 bytes
font_01_sfnt_off00010cf3.bin
144ee6e41e0ce08cbbfda922444df11ce7c5a8485a8fca771058a4d24faa738b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 10712 bytes
font_02_sfnt_off0001318a.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1318A 16092 bytes

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