Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8038845945e0a59…

MALICIOUS

PDF

37.1 KB Created: 2020-11-07 21:04:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 335d06fa754acaa5081a58ffb0268779 SHA-1: 67f1f98cda45b093d195fd529b6dfe37acc2259d SHA-256: c8038845945e0a59075c0029dea6eceb564f35c4242ae6483da1c0ad07941b5d
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://trafffi.ru/aws?keyword=jones+barbeque+and+foot+massage+lyrics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5f8a974c8d637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445892/normal_5f9f766be993d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387050/normal_5f999e09c75be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385631/normal_5f9a3c5d5b558.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/27a9ad3c-87a1-4815-bdbe-ba2de25a4668/devil_in_the_white_city_quotes_part_2.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/amadeus_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7bdd197-f538-4a6f-9568-1b761b88411e/44778705931.pdfIn PDF document text
    • https://japukijoj.files.wordpress.com/2020/11/piwefuwaroribaguzurew.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/67084161531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3fc4801-2395-44af-a497-61d8ddf8e392/dewurolabopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de76fe20-4c38-406a-8322-3f095db02209/82135781822.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/hemkosh_assamese_dictionary.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_off00004f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F3B 5700 bytes
SHA-256: ca86355b12d6f4ae842e9029368dd53f091f4d7869f0ca42123185128b6b7169
font_01_sfnt_off0000628a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628A 10920 bytes
SHA-256: 356c739c851f010d551a8ec4f7499ec8942cddd74cfcd9f6c479fa0d52cb8ed1