Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdfc4c496f49d0c…

MALICIOUS

PDF

45.1 KB Created: 2020-11-05 05:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 2692b1b739172a0e6a42420aedce2b98 SHA-1: 673248adc9caf46861f1b2bb78cd25f5e4b3ca6f SHA-256: cbdfc4c496f49d0c2ec5f4ffc36a6d572d889356ab39290ccbd66c1c3ebabaac
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://cctraff.ru/aws?keyword=shadow+health+heent+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393485/normal_5f93fa6d5ad15.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/mozagulad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_5f9f6b181f9c7.pdfIn PDF document text
    • https://fivilogavizizov.weebly.com/uploads/1/3/4/4/134446089/tibegifi_zanegasivaji_felepoko_fikamawowamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_5f9ee0e4006f4.pdfIn PDF document text
    • https://luwamagol.weebly.com/uploads/1/3/4/3/134375262/4454167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392453/normal_5f8ef6d016448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f8d92ed5bddf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402503/normal_5f94e380655a3.pdfIn PDF document text
    • https://panemomozig.weebly.com/uploads/1/3/4/5/134503052/rawigitu.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/44e6caa1-3c24-4f77-aba7-78e9a238a200/how_many__and__bonds_are_present_in_a_molecule_of_cumulene_figure_1.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/20812566271.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/nderungskndigung_mietvertrag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f357ab9-6d16-489f-b5ca-85ebefc36986/72493438512.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/juan_salvador_gaviota_ensayo.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/mount_saint_john_academy.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_off00006d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D86 5108 bytes
SHA-256: 4ec0b87c94bf0b50fc34ec4a64450144199d54f000e743acac595680022e8f7c
font_01_sfnt_off00007ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE9 12952 bytes
SHA-256: 41d5c4e54685f67dd61929138e9620ed6fae0f49f619f946202493d28e666c32