Malicious PDF — malware analysis report

Static analysis result for SHA-256 8edbbf6329e061f9…

MALICIOUS

PDF

56.4 KB Created: 2020-11-06 03:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-18
MD5: bc5a71ce0364d6076442bd3768f6d9a2 SHA-1: a43139676647c1975c7b1e658cf2175d71fbc793 SHA-256: 8edbbf6329e061f93b5bbe24f91f508045b9b1c9a64485d45b18d2a653d6a320
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/123?keyword=interactive+physiology+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5fa03a5c674e2.pdfIn PDF document text
    • https://xigokerurubupa.weebly.com/uploads/1/3/4/3/134312623/gisimifo_kepukadat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_5f8f3ef9a1753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5f964f24e58d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445557/normal_5fa35961a6c9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_5fa49553ef8f0.pdfIn PDF document text
    • https://bedakowunuva.weebly.com/uploads/1/3/4/3/134342711/9720403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372376/normal_5f9569e35cc5a.pdfIn PDF document text
    • https://xavixikani.weebly.com/uploads/1/3/4/5/134502132/2954298.pdfIn PDF document text
    • https://mesipaku.weebly.com/uploads/1/3/1/3/131383407/821646.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/jivuxo/50822915276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ebc8328-d7e1-4839-8e98-b93e6fadce18/mr_president_game_no_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/fulobixeposijibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2fd4851-d7e3-45b2-93a6-b250de2a61c4/jimixepafujalidaw.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a5da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA5DA 26264 bytes
SHA-256: 54b2545b9557f8a45670af806fe18e59aa9145764c08bf41d7fdc5ab3331f1a5
font_00_sfnt_off00006e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E53 5452 bytes
SHA-256: 1a7bd3cb0db93db4fe94fd566dad0e9b1c81e3eab9772f459c8ac85d5a5e9722
font_01_sfnt_off000080f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80F5 10728 bytes
SHA-256: 711e88732fcb6229df85fb887b4ae366b4b8dc4197be747b08f941475958065e