Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3d0c6e755c4c26…

MALICIOUS

PDF

42.1 KB Created: 2020-11-09 12:19:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 71916b683b46c8cc57bcaf7c9789e976 SHA-1: 93bc303e3d82a9a716868ffea6f9119720caf6b1 SHA-256: fd3d0c6e755c4c26095ab4f53c9185696ba0e01aedf35af70339729e59d96c55
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://trafficel.ru/123?keyword=tintin+in+tibet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5f9786f7b8b76.pdfIn PDF document text
    • https://vafuzetok.weebly.com/uploads/1/3/2/7/132740798/kegokevix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425230/normal_5fa29d7fb3a95.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/213855.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5f8ae6e45c7f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5f9f427dd4ae7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_5fa370bf9aa25.pdfIn PDF document text
    • https://tiwilofudux.weebly.com/uploads/1/3/1/6/131606348/7074581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5f9776a1c7ca4.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/kasuwevovog/logaxusurube.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_off00006795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6795 4608 bytes
SHA-256: 3e6856e964fabf4fc211ce9abfc80dca0724668e5bd448c08c45871bb0698984
font_01_sfnt_off00007754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7754 10692 bytes
SHA-256: 0eb15d614d5b115a1d49ed9aa3a568be80718f2633a5d0bfd4a37f10735cc808