Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b381784e5f6c49b…

MALICIOUS

PDF

43.8 KB Created: 2020-10-26 17:55:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 641c609b4042b17e4e5a699dc749b26f SHA-1: 1fb4804355a58374b2bb0dd1752c8c9248c3c723 SHA-256: 7b381784e5f6c49b03ed964fda3c714e1dde6100bb4fa4a422d5c0dc0dd28f74
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.cc/123?keyword=%25C4%2587wiczenia+z+pi%25C5%2582k%25C4%2585+na+kr%25C4%2599gos%25C5%2582up+l%25C4%2599d%25C5%25BAwiowy+pdf In PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/manovabesedu.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/rugemamoronesa-nemarigevuligo-rukozogipakak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5f8bbf633869d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380237/normal_5f8fc76074b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f87808e16cc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f8bd53ddb900.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/vixuwogetiv/building_blockchain_projects_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/singular_plural_nouns_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/meteorological_hazards.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/ganorekugevedusobubaxi.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/gusivekegedosoravizu.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/wovazami.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/fool_me_once_download.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/block_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/tateyama_kurobe_alpine_route_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09e2519a-b999-4134-8481-46f769c8f047/5032353543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/296854ff-712b-4f97-b833-b3a5384b2e15/76103182035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad063182-171f-43af-88f5-da9580cf699c/83222313927.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_off00006584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6584 6256 bytes
SHA-256: 5859ad8d7a1d856c67687975c3610cda3574867330b7ca59156032268c417108
font_01_sfnt_off000079a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A9 11868 bytes
SHA-256: 25368ec96b1dc7fc184ef058634a10281aa7f183f2e9ab6b301949674a38b5c1

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