Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21770b711d88f24…

MALICIOUS

PDF

39.4 KB Created: 2020-11-05 15:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 552d5306e6842812f56290e3d3df6518 SHA-1: ab139a9eeade32f73b2cdcf3451e8656ddf4c4db SHA-256: e21770b711d88f244b933ed6635e343b62abb17b6d44171203a1cd306992aa92
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=jbj+12+gallon+nano+cube+deluxe+aquarium PDF link annotation
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/zebitajoze_lamadamu.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/fulugubu_devenujopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367627/normal_5f9c8cd8152e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f87387de13e9.pdfIn PDF document text
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/ec21da4970a8034.pdfIn PDF document text
    • https://kifisiwa.weebly.com/uploads/1/3/4/2/134266158/lotisumeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447431/normal_5fa38ffc25020.pdfIn PDF document text
    • https://wojeribexojuxu.weebly.com/uploads/1/3/1/8/131856158/xarevurozurovip_wukefem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5f8a96551c2fa.pdfIn PDF document text
    • https://xovozenoz.weebly.com/uploads/1/3/4/3/134348708/ronigamid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_5f96bfb3e0e56.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/7360136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f873edb04aff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_5fa1b601c4764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_5f9ac701334a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pusolefosex/lesson_2-5_algebraic_proof_practice_b_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/dojimomisumuru.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BE2 5464 bytes
SHA-256: ebe37d5e3f2e10ae6af18c850e193436e1bd7f55c79ab0b2db7ddc6bc10c3db0
font_01_sfnt_off00005e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E54 10560 bytes
SHA-256: cf83af5f0ab8e9f272d2f552c11c7e06d71ad80402d2a334e66bdf967ad624b1
font_02_sfnt_off00008254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8254 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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