Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c51126b1d09cb0f…

MALICIOUS

PDF

42.4 KB Created: 2020-11-08 00:20:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 39697f48240c951c1a2d6102c2a2e285 SHA-1: bdc257a7785c046cf4970b1170f02ce1d3c2ae49 SHA-256: 0c51126b1d09cb0f86e97c3f60a74c74bae84347da4f5446e7eee134109456d6
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://traffset.ru/aws?keyword=suzuki+ltz+400+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418385/normal_5fa63f1167ced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5f8913977c3bf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/guvovigo/joindre_deux_fichier_ensemble.pdfIn PDF document text
    • https://xanafegeze.files.wordpress.com/2020/11/vewakajojajibo.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/pibobejifobukideru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0721c42-b4a2-46b7-8a32-7a289fae91b3/2244214693.pdfIn PDF document text
    • https://zugipokojer.files.wordpress.com/2020/11/fofaxuwor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b5e9734-4a3c-4c99-b0ba-c00572b0c73f/vodobimo.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/98083287078.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/48125111036.pdfIn PDF document text
    • https://ripigewub.files.wordpress.com/2020/11/ditukalabekorutasekavoj.pdfIn PDF document text
    • https://wetijagavur.files.wordpress.com/2020/11/desarrollo_plantular_zea_mays.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_off00005ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCC 5360 bytes
SHA-256: c123af65ab66e2dc9f044fb3ffce01f6e8c51301a41f3f3b7e1ddcae3167e1ec
font_01_sfnt_off00006f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F10 14432 bytes
SHA-256: f2c39844dbf7d5fbba5dabe4ad20818f1b8a7345a1245344b25a05c6f2e510b0