Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6e1e49262652f9a…

MALICIOUS

PDF

54.3 KB Created: 2020-11-09 13:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 3b5b598920d3c707c25ea66caae556e4 SHA-1: af7ef2f99aee751c6b766d63ea9c57fcb4f23642 SHA-256: d6e1e49262652f9a360d7ef23a495db102f3c1ac11ea0e6737e30013b9e31d04
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/123?keyword=chapter+17+quotes+from+to+kill+a+mockingbird PDF link annotation
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/24a90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5fa4d8e4797f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f8cf66aed984.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/9da8b3d101038cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_5fa8869bf1c5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5f88b957016d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5f88bf931415c.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/a3c0ae21-0baa-4e7f-8e0b-be1fac95c435/forsaken_world_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/define_general_deterrence.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/62907175574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f364c3b-cff3-4d23-95be-badc761ae974/sazivigigogepino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60641ed7-54e1-4264-8528-3a9b37a4f6ed/74635750377.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_off000094eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94EB 5936 bytes
SHA-256: f54acbf6e46e78b8d78e1ca9579c0005e7729f8924ec8303c6b6432566f3792d
font_01_sfnt_off0000a8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F5 10288 bytes
SHA-256: 3d34912ed329ed25f5e9adbcfe0f0e422a72f606116052dcc35ef2f13b5136ed