Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f5e22b047e32c5…

MALICIOUS

PDF

40.6 KB Created: 2020-10-28 14:37:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 38c00bd4a86cfdf168b47e96d2be9956 SHA-1: 9c781b5372e6e14f08e2d8a2919d5bf86b6977e8 SHA-256: 96f5e22b047e32c5bbd4503befc8f51355a541f470c0b6828c0fa787197c595d
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=cuckoo+clock+weights+stuck In PDF document text
    • https://cdn-cms.f-static.net/uploads/4390995/normal_5f97141a86985.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/birekikogapeneto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_5f967f5e556fc.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/1a701260-c668-41ac-bccd-707a7a3906a7/92464970719.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/86471278703.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/kosujive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d11eba0-2988-42e7-a799-620cc990bf58/28669794274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/959c8243-6485-4eb6-9409-fd6e4e5651cd/54712747982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18164c4-e46e-4a9a-acc9-45b0bb64235a/nexibanowolopemilubijer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8c2488-9ade-4302-8fe0-2751b41329a8/49988508200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d99887f-35fb-444f-b164-a2881cc146d1/pesitetixisizir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8259b41b-6566-4316-9eb3-6b4c0baeacc3/wuzibiwupisososadubik.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/adenovirus_tratamiento.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d137ddac-7f0e-4bdb-acca-a4fc69ea7dfd/xotikovozupufijegegat.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_off000062f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F5 4816 bytes
SHA-256: 3ca768a8e68936bbb0f4572c70dc7c3982475039d8fdc40f84c5bcb28f277ed8
font_01_sfnt_off00007373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7373 10192 bytes
SHA-256: 3cbed863c7ba0631f70e20ee6cd894b814f4faf560ba4856e8e97d028226fffa

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