Malicious PDF — malware analysis report

Static analysis result for SHA-256 581eaaf384857635…

MALICIOUS

PDF

42.3 KB Created: 2020-10-31 10:48:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 2ef325a8d2bccbbb66d537fbcba5084a SHA-1: 839c4abfce833724c09eef76d8553001231254ec SHA-256: 581eaaf384857635c1bedb463909eca0a481e27861d547854b754434b27aa0a2
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?keyword=razones+de+cambio+derivadas+ejercicios+resueltos In PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/8d959c.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/joroxezipabiju-poberakin-zigifaturevoled-vodedokotopidam.pdfIn PDF document text
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/304764.pdfIn PDF document text
    • https://kizozejibudi.weebly.com/uploads/1/3/4/4/134460324/wikew-nelujowavodorux-bamakefarifosa-feluvuno.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/1652488.pdfIn PDF document text
    • https://zibeselev.weebly.com/uploads/1/3/4/1/134131471/lopapedudu.pdfIn PDF document text
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/jevijefepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414159/normal_5f956ea068566.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8172/0515/files/bozewofefi.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/translating_verbal_expressions_into_algebraic_expressions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9692/3040/files/detaduvusezapifuwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/7853/0237/files/the_boxer_1997_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5286/2113/files/baixar_antivirus_avg_gratis_para_celular_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7016/7486/files/retajutubafetir.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_off000065d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D0 5416 bytes
SHA-256: 68298a866e5d47f28a934bf4c6238cbe94240ee9ea0165488998454d5fe5c9b1
font_01_sfnt_off00007837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7837 11132 bytes
SHA-256: 98261b59f4d851326ea20819d8fd00ea6052a9b65f3f5759a78b3a3c71dedccb

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