Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5c4b82a2915d14…

MALICIOUS

PDF

45.9 KB Created: 2020-11-08 14:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: b4dc39162d0bb42bce0b6e16c00f5b0a SHA-1: e69cccae030a6e005e9b33990b8138ae6a91064a SHA-256: fc5c4b82a2915d142d53e3e461d1f436fd77d21f4c591b01dbc97a6174b26fa4
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/123?keyword=marine+survival+gear PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416939/normal_5fa1c600f2814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465919/normal_5fa7d2384009c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_5f8ebb762dcba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f873413bc404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f9be4aa9c5dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gozevawu.files.wordpress.com/2020/11/84746957954.pdfIn PDF document text
    • https://segugalase.files.wordpress.com/2020/11/exercices_nombres_dcimaux_cm1_impri.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/94424780343.pdfIn PDF document text
    • https://xupuzen.files.wordpress.com/2020/11/xirokukeligalamenetobu.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/38774272173.pdfIn PDF document text
    • https://xixojis.files.wordpress.com/2020/11/zerilelefejejak.pdfIn PDF document text
    • https://zojemadej.files.wordpress.com/2020/11/73587489466.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_off00007122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7122 4920 bytes
SHA-256: 7994f2e0938fbdda25038d516851a3d5f89c28283214cf186de6e9a53d78d216
font_01_sfnt_off000081ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81FF 12208 bytes
SHA-256: 9fd29cfd602838515e39c8105f016171583a55f7b41269a873ec2939917dfdc4