Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ffb8af75b48e95…

MALICIOUS

PDF

42.1 KB Created: 2020-11-07 03:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: c0f65e754190e9eae79cbeefe81fb286 SHA-1: 0a1b39ce438d15673022a02010a0e594106c5415 SHA-256: e4ffb8af75b48e95e06972cf8f60886bef7ece145b2f3b4e799e95fb29abbaac
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://trafffe.ru/aws?keyword=the+little+brown+handbook+pdf+free PDF link annotation
    • https://vezerovir.weebly.com/uploads/1/3/4/5/134580053/4489707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f8db7de29440.pdfIn PDF document text
    • https://jokineviraxara.weebly.com/uploads/1/3/4/2/134265776/7034573.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/banaref.pdfIn PDF document text
    • https://bososafevibusup.weebly.com/uploads/1/3/4/0/134041518/gevixurovizivugexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403948/normal_5f99209b321dc.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/f9282.pdfIn PDF document text
    • https://pasabegimukug.weebly.com/uploads/1/3/4/2/134265340/wobefebuvafa-joxadejesi.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/35967f688.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vipuvixo.files.wordpress.com/2020/11/19025823963.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/nidufu.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/72728357307.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_off000065ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65CA 5196 bytes
SHA-256: f8e1cadebc9d3658c39a23d00e7c232d2a57fbb5c0d4f84e397750e412636c69
font_01_sfnt_off0000777c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x777C 10460 bytes
SHA-256: e48d4650c8dc576c08b2c458b83428bdf3b15aab37ef438dd2c96d8a4e99026b