Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0686d2b2e9a958b…

MALICIOUS

PDF

40.5 KB Created: 2020-11-08 02:38:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 99cdef6f321d8e20d8ae6d2780ec44f8 SHA-1: 4291caeca13f48bc59a20222487238336145bb73 SHA-256: e0686d2b2e9a958bed3e0ecc290dd015928666c8f3c6e50eee7f98d14a173879
136 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=articulo+47+ley+federal+del+trabajo PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5f98f21e22c7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5fa73a94049d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5fa008edc403d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_5f90ef7133603.pdfIn PDF document text
    • https://bosizeke.weebly.com/uploads/1/3/4/5/134596703/valotapi-lukasesakijebaw-wuzewekar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b39b5b1d-5b9b-45e9-b656-b0422c57b911/damalujamemepoxonedomal.pdfIn PDF document text
    • https://rezekine.files.wordpress.com/2020/11/tatojesanawav.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/nenezogoke.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/sunufasugodiranamo.pdfIn PDF document text
    • https://rarokazuj.files.wordpress.com/2020/11/sowunozepetariw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d689e0e-3343-4576-b379-dfd74f91b95f/de_march_oligopolio_et_monopole.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_off00005fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE2 5312 bytes
SHA-256: f614fdbfcc449094925ee67b24d153d75f2fd629cd0e794d91e5b2678f1ef546
font_01_sfnt_off00007221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7221 10320 bytes
SHA-256: 528ce9eca224f6d16da6385a291891dd20b953287900ab2043a1005b58ee9423