Malicious PDF — malware analysis report

Static analysis result for SHA-256 a655eab53d1e5075…

MALICIOUS

PDF

39.3 KB Created: 2020-10-01 11:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: ff113ba919439398853afe77759c97b7 SHA-1: 56fc7faa2604bb26501dd269c50c55dac33498e9 SHA-256: a655eab53d1e50756a55183deafa4e4a1f788cf66f489fe8b0807248c5aa874f
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://ggtraff.ru/strik?keyword=neurological+disorders+textbook+pdf In PDF document text
    • https://site-1036746.mozfiles.com/files/1036746/7382970162.pdfIn PDF document text
    • http://files.matsujewellery.com/uploads/1/3/0/8/130873826/gofenur.pdfIn PDF document text
    • http://lijaxa.daniellebegnaud.com/uploads/1/3/1/8/131857090/lijawanufaw_nisuje_foliwimijo_sufukido.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/d9de72a2-6dfe-4fd1-ab4c-01d0d2cebdce/23428994298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2522f873-af1f-474d-bb4c-186bb1f1a8bc/39704965859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c1cd6e-c38b-483c-a4a5-f26704d90e4e/vivoduv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58fb6c31-313c-4bdf-af81-14f99dc4f030/58024714370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbcb1f1f-9972-473d-81bc-135e5e6e310d/gagisepikutodasiwef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac1fbf03-5595-409f-9661-1f7aa3a58fa1/tepevenikunim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b84b4631-c466-4f4e-bdec-69159f70c810/reped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61e70da1-a5fa-489e-a9a2-ad821122fb6f/jiwojibatujeguju.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_off00005a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A32 5564 bytes
SHA-256: 24563fefc6421de7d0941b68e1c46ca2d367ed4d2fbbc9a1c00d2fa6214b31db
font_01_sfnt_off00006d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3A 10480 bytes
SHA-256: 6d3064159b61af4e5fbba4a96149e67a435d42316e9266a2ff3eecdc1b5c87db