Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d9b09cb2994ed9c…

MALICIOUS

PDF

43.8 KB Created: 2020-11-08 06:18:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 924034cc162276276f0bb7132f006ecb SHA-1: 9e1a102131780797e8873f1ecfeb6ea01543e53e SHA-256: 7d9b09cb2994ed9ca575bc43dfe9e50c056c5be268efef9ee1f793f08fe12f53
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://trafftec.ru/aws?keyword=georgetown+university+calendar+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369328/normal_5f891306d7e6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_5f8eb7d214123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380530/normal_5f8d22b36a80d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404113/normal_5f9b965aba256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388620/normal_5f9657f8c07a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f9191d6e96cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_5f948b76d9dff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://tusomoxuxa.files.wordpress.com/2020/11/lixorasiladujofofu.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/beehive_class_9_english_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/kamavutixutit.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/vapour_compression_refrigeration_cycle.pdfIn PDF document text
    • https://s3.amazonaws.com/gonuxiwela/robatuxuporexenixi.pdfIn PDF document text
    • https://riseruzu.files.wordpress.com/2020/11/wavufepatirovopulila.pdfIn PDF document text
    • https://paseneg.files.wordpress.com/2020/11/les_etapes_pour_creer_un_site_web_avec_dreamweaver.pdfIn PDF document text
    • https://sekusiwek.files.wordpress.com/2020/11/48225579676.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D90 5548 bytes
SHA-256: e61ec9eb5a9bb9e354d3e234af07ecbf1aff65943cfbee821096ae956ae269fe
font_01_sfnt_off000070a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70A1 10416 bytes
SHA-256: 99d40e618e6399303057a4a8afade2388c0ac06c5251269b475e751f0e14d3fb
font_02_sfnt_off0000941c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x941C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333