Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc441f31b284d2b2…

MALICIOUS

PDF

63.2 KB Created: 2020-11-08 16:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 0f26ea15762888b305d68a73516aafaa SHA-1: 41a2bce79b4bbc11ac6f69aba06bcfec62a67092 SHA-256: cc441f31b284d2b2e187444e02599c934ff484fcfd2d899e1612b527c88af11d
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/123?keyword=basic+electricity+worksheet+answers PDF link annotation
    • https://pesodubebugi.weebly.com/uploads/1/3/4/2/134234841/2181820.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f8935e35667b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378618/normal_5f8d740297653.pdfIn PDF document text
    • https://duririsi.weebly.com/uploads/1/3/4/0/134096382/togan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404488/normal_5fa4574543557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_5f9f56071748e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xewuripew660320655.files.wordpress.com/2020/11/fovagasadalimedav.pdfIn PDF document text
    • https://sakazedeg.files.wordpress.com/2020/11/15229409964.pdfIn PDF document text
    • https://bozuzukisiz.files.wordpress.com/2020/11/94727665605.pdfIn PDF document text
    • https://tarakuluraxe.files.wordpress.com/2020/11/neogeo_zip_not_found.pdfIn PDF document text
    • https://sovezetazej.files.wordpress.com/2020/11/41948831472.pdfIn PDF document text
    • https://gogajajar.files.wordpress.com/2020/11/48539197016.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_off0000b944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB944 5192 bytes
SHA-256: 85a8b5964fde75780f6088c4a0ea8a9797b232a117772eac197f80d359a48c8e
font_01_sfnt_off0000cb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB00 10788 bytes
SHA-256: e9afbc571f257a0cd368e305a587e4efbe273ee5c167d2f83c6276b7d4db1b92