Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fc3eb08cc9953a…

MALICIOUS

PDF

41.6 KB Created: 2020-10-09 07:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1cc405a73ef5d32a12933988b985f65a SHA-1: 678900535a412101627284dbd77f3f10eaec1091 SHA-256: 65fc3eb08cc9953a6253025c4873c7b65786167ad5f997d79e23e744e90467f4
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.com/pify?keyword=writing+equations+of+trig+functions+worksheet In PDF document text
    • https://site-1038505.mozfiles.com/files/1038505/tiwexanuputoviwuze.pdfIn PDF document text
    • https://site-1038944.mozfiles.com/files/1038944/49560794129.pdfIn PDF document text
    • https://site-1039203.mozfiles.com/files/1039203/21797868095.pdfIn PDF document text
    • http://files.sevicklaw.com/uploads/1/3/0/8/130874329/5508817.pdfIn PDF document text
    • http://files.do.mrazamerine.com/uploads/1/3/1/3/131382078/1890996.pdfIn PDF document text
    • http://files.markwilsonmusic.net/uploads/1/3/0/8/130813988/9963133.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b9e66476-34fc-45fd-ab7d-5da52acad58d/97839052433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91e48462-978c-43f7-b693-91caab567f4c/25862296458.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fbcba13-817f-41ee-9f5d-e18b1c05e78e/pepanixunosadinimabesejel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7bb1922-af1e-4577-8475-5c8b8d4560f4/zewawonepewilera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8a6f0d-25fd-456b-8ca4-e49d8622813b/xetaxe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55EF 5288 bytes
SHA-256: 3a060a1f53f78ec22454bf6d2e55212336433b0594a677858bb4bd73d346e0f2
font_01_sfnt_off000067ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67FF 10428 bytes
SHA-256: b13fd5ae875b94837092d10015502314cb1d50afbc983f339f0fada5993d792f
font_02_sfnt_off00008b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B92 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2