Malicious PDF — malware analysis report

Static analysis result for SHA-256 4378ae8ccbc2fc57…

MALICIOUS

PDF

64.5 KB Created: 2020-10-16 08:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 8dfd7bf8eef98429566622c0d8d75296 SHA-1: ebb6bb8d4f80e5a2cd4adc786e665a1cc0dab52c SHA-256: 4378ae8ccbc2fc57275a84b990e813825802f9cfeb57fffb2c2b0da0a81281a6
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/123?keyword=disaster+preparedness+philippines+pdf In PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/1957816.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/665612.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/50b3a186-73a2-4099-b115-54a49d923514/18728150251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df3bbe09-8d0e-4662-9d96-daf0c8536c15/gisijizexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b75715-1e9e-4e3b-ac8a-6afccf28ecbb/rosakejomiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9bef475-77a3-45e2-8a76-e91db0de4fa1/janenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f77d3d-579f-44ce-88ae-ee7c3faa65e6/27209212621.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c14dba-615f-4508-8de7-e942d84d90da/3327414189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15604b7b-2993-45af-acc1-aeb4cb2a4823/86166208373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda70713-466e-4677-beb4-d7380390a2c7/36454993664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b46e61-af03-471d-9bf5-8f83707bd908/51672586387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/345be4cb-6643-41e9-a4dd-64dd1aab8c35/dinadap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2aa54e4-bf92-461f-8948-71e640cf2eb8/32912580561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93bee0e9-ca2d-4e59-8cff-89787f8e7b12/46536183171.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a6d6aa1-473a-44aa-b1f8-a868bf88c2e5/kexafanenisovelox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a55e33-ceb5-4af4-aa77-501bed40dab2/59857858196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79662f14-b17d-42fc-8604-35978d883d5b/40803716849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9edd9c96-ae3d-4e74-a2eb-f5e81f3415ad/nopakoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9e6a85-8156-48a7-8243-6da4feced067/petaboboledibajesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5395df-5e0b-4a73-bdfd-0c17ec3c2504/22286423061.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_off0000b140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB140 4804 bytes
SHA-256: faf30cb93d42b80776ba499e19b5ab9cde74623f355312172061138fdde5fc3e
font_01_sfnt_off0000c17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17E 10788 bytes
SHA-256: 18f39653d0e657a6bde51a381f8489ab1f687e8a0fa09a856188ac5e32466b52
font_02_sfnt_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3