Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b59d6ef24e5b84…

MALICIOUS

PDF

44.2 KB Created: 2020-11-08 07:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 4edf5387bebe5f76eaba2739e08d5fde SHA-1: ef3dd9ae97e5981e867007c990773ce3540ba19b SHA-256: f8b59d6ef24e5b84a4e3fb9b40c6708c9b9d26d66ebb9f263e136b9326511be3
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=openttd+server+hosting PDF link annotation
    • https://wimejevufafej.weebly.com/uploads/1/3/4/3/134379448/kebebolufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384482/normal_5f8d8bcca34fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5fa473beef043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_5f8a97e63871f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_5f9fd433a9afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5fa1ed3b0b0d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_5fa40c48ea86b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_5f9e34ace09a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f8ad15927fec.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/7012992.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://pesasopereza.files.wordpress.com/2020/11/bomezadit.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_off00006ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA2 5064 bytes
SHA-256: 1c7d446111f0ab12eba9dd136a2dd7e92c7687d276b68e550d7a2eb1c48cc8c4
font_01_sfnt_off00007fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE1 10724 bytes
SHA-256: d7d11172fe90e72b96bef232fd8a0994c75ff839072228dbca22265eaa60dd48