Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd4bcfcdf6db784…

MALICIOUS

PDF

42.3 KB Created: 2020-11-09 07:55:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: e403d1a301858706949db21904d6c799 SHA-1: 50c8070cd641d709bfa74011ed7c6f6632b3da32 SHA-256: ecd4bcfcdf6db784351496bd4bc5d20a17c420b6369e290153426d5b73480e1e
126 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafffi.ru/aws?keyword=delta+math+students PDF link annotation
    • https://komimuvupelogi.weebly.com/uploads/1/3/4/3/134312664/pikaj.pdfIn PDF document text
    • https://mabudorowux.weebly.com/uploads/1/3/4/4/134458492/zibip_sinatiri_joranotabemufa.pdfIn PDF document text
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/jereriponuxurav-parasewewikowa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pokavewizux.files.wordpress.com/2020/11/4598600829.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/30036510301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95bf59c9-14d4-4288-96b6-4b8e512b6ae0/gikar.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/10215183018.pdfIn PDF document text
    • https://sisiviweze.files.wordpress.com/2020/11/50939477702.pdfIn PDF document text
    • https://gumipatu.files.wordpress.com/2020/11/origin_error_code_16_1.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/kannada_numbers_1_to_100_in_words.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_off000066db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66DB 4968 bytes
SHA-256: a5ae5c2f6ee7c4b8ba9a1feacbeab27889699c3fe69afa2250e6bd816bdf0f37
font_01_sfnt_off0000779b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x779B 10944 bytes
SHA-256: 8c076f3618127df5ecc87d2390d2e9d888e7ed34281178807cb4433ebd854772