Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23a9a85417b2527…

MALICIOUS

PDF

85.4 KB Created: 2021-06-12 07:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 94c58d279e40155d4b323efc9f0b6c7f SHA-1: c442b8bc7d9811d35521122722180e8696745daa SHA-256: c23a9a85417b2527030262a7da44d0c7e87064dfd10f0e7ca56ca2a4ca703bfd
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. 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 numerous external URLs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/pbw?utm_term=joseph+murphy+power+of+subconscious+mind+pdf PDF link annotation
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/8208032.pdfIn PDF document text
    • https://removevas.weebly.com/uploads/1/3/4/4/134443453/5098259.pdfIn PDF document text
    • https://nokogijesa.weebly.com/uploads/1/3/1/4/131452879/nakixoxosusewex_jerorijowiju_tajinilad.pdfIn PDF document text
    • https://metaxilam.weebly.com/uploads/1/3/4/7/134723413/sejobusurelijogik.pdfIn PDF document text
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/niwatefonope.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/tiwuren-wezomulezaluj-vejababasofamim-wajuwejixoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385437/normal_5fcb71b42c78d.pdfIn PDF document text
    • https://radotarurejatu.weebly.com/uploads/1/3/1/6/131607565/4598099.pdfIn PDF document text
    • https://wuluruvujomokax.weebly.com/uploads/1/3/5/3/135349857/6091439.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372985/normal_5ffff226aad48.pdfIn PDF document text
    • https://toguxobuse.weebly.com/uploads/1/3/4/9/134902292/fezux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e6fb8db-0c76-474a-9da7-5160fb6b2dfc/18279061544.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/ganozofafonenow.pdfIn PDF document text
    • http://lesotarizim.pbworks.com/w/file/fetch/144823923/wokatudewavosinazumonoju.pdfIn PDF document text
    • http://nafidob.pbworks.com/f/povegikabujogokemaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdcbb148-91af-4c35-a55d-7b1c1af20aff/english_grammar_book_class_7.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144422562/las_7_claves_del_exito_de_disney_resumen_capitulo_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65869491-5680-4a74-b609-7f7cc3ed2470/protein_monster_vegan_enchiladas.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/what_is_vitiating_factors_in_contract_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe5d61b-3495-476c-aba2-8ec20e14c1d5/zatamodovukugidakax.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_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 5476 bytes
SHA-256: b0031b9fc7e5ca0bad8a336039a56ea629e6da1e4ac5df2551d6f80107f2ccdb
font_01_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 10632 bytes
SHA-256: 6727ccef9775d7124fdfce0d24af7674f189ed1574dcad7aef47740e3c833940