Malicious PDF — malware analysis report

Static analysis result for SHA-256 7483953ba462ce0e…

MALICIOUS

PDF

77.5 KB Created: 2021-05-12 11:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ff52db8a557de21ca714ab5c4ee7d611 SHA-1: 23c61227f65e930844730fe5a9e82d42dfab804a SHA-256: 7483953ba462ce0eb0ac3fc54087ee4f262c704ca5f6cfcb42e4c7ff07290c82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to various domains, many of which appear to be disposable hosting. The heuristic 'PDF_SEO_LINK_FARM' indicates this is a link farm, likely intended for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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://dugedepap.ru/strik?utm_term=how+many+months+to+train+for+a+half+ironman PDF link annotation
    • http://kavademive.sportsontheweb.net/34611179869.pdfIn PDF document text
    • http://fofoketezifofi.22web.org/kukerugugovi.pdfIn PDF document text
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/kexili_luxanip_porakalepuk_refezatonineti.pdfIn PDF document text
    • http://vovality.club/1996_7.3_powerstroke_repair_manualcdin4.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/kogunavujim-pawoto.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/9682954.pdfIn PDF document text
    • http://joxutikomujawi.iblogger.org/getting_to_yes_drive.pdfIn PDF document text
    • http://guvetosufawi.22web.org/hp_pavilion_dv6_3000_service_manual.pdfIn PDF document text
    • http://devedilazabu.medianewsonline.com/partisans_of_allah_by_ayesha_jalal.pdfIn PDF document text
    • http://eurofamily.pro/the_entertainer_free_printable_piano_sheet_musiclkzab.pdfIn PDF document text
    • https://fiwofufoneronup.weebly.com/uploads/1/3/1/0/131071066/4470693.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/8afbf6483c40.pdfIn PDF document text
    • http://fodosokidorakig.22web.org/jipezitimoxede.pdfIn PDF document text
    • http://aires.fun/organelas_das_celulas_eucariontespm7e7.pdfIn PDF document text
    • https://wolaserirefuf.weebly.com/uploads/1/3/1/6/131637046/rikaguneruwovel.pdfIn PDF document text
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/1949603.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/fedur.pdfIn PDF document text
    • https://jonusozulat.weebly.com/uploads/1/3/4/5/134523624/5800670.pdfIn PDF document text
    • https://nutikatike.weebly.com/uploads/1/3/4/6/134601603/bepawe.pdfIn PDF document text
    • https://kofetasug.weebly.com/uploads/1/3/0/8/130874362/gajimekumok.pdfIn PDF document text
    • http://saniwofixapu.mygamesonline.org/lovabupekigida.pdfIn PDF document text
    • https://tovuwopisivid.weebly.com/uploads/1/3/4/6/134640328/9394823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bejerokifeko.rf.gd/what_is_universal_set_in_set_theory.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_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 5160 bytes
SHA-256: 7b8e289fb83fe83a85dee133da80141b036ceb722dabf5e8c67d38d5cbf535a7
font_01_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 10636 bytes
SHA-256: 78a383ed323275405131b772dcf95de9cdc688b8c89e1d010e745b97c995c81c