Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e20be4609f6ac95…

MALICIOUS

PDF

46.4 KB Created: 2020-10-02 09:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 7a87916ed4f12b628f71ac3e58dcd868 SHA-1: e62172566fcb8d7a72f471c5270de1b1d65b855b SHA-256: 0e20be4609f6ac954a672f177cc81316fc34d781971b593d5ee773bc9e8a77a2
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/strik?keyword=pathophysiology+of+acute+gastroenteritis+pdf In PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/rasoxenibowoxaxovikodob.pdfIn PDF document text
    • https://site-1037865.mozfiles.com/files/1037865/vixijusokakasagodurovebop.pdfIn PDF document text
    • https://site-1036900.mozfiles.com/files/1036900/78501147384.pdfIn PDF document text
    • http://files.billmohrart.com/uploads/1/3/0/7/130775475/3930511.pdfIn PDF document text
    • http://files.widisposal.com/uploads/1/3/0/8/130873916/8df459f2801c3.pdfIn PDF document text
    • http://files.australiantimberflooring.com/uploads/1/3/0/7/130738792/boron.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/250a7da1-3e59-4123-a2a9-96692860f7ba/tixuzumakewosukimutotenuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3081e94-a2eb-4665-8894-6700f576cc84/sefevodabojevafawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b51dcc-c750-4f82-ad8b-32821b935746/88781141946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f93ad18-d611-4360-8ec9-07907676b096/dituzodezibevalip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/736d6f4a-a4f9-41c9-a8ed-5d894f462a98/81538585833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206ea334-e33d-447a-b04b-27c25943716b/63594862969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3918b274-29fc-4978-99ec-f4c513f42370/wotatajagotolotepowefumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e8cfe47-b9b8-44f0-beaa-627feb5ea1a2/26965474.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_off000075dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75DD 5520 bytes
SHA-256: 0769bb9fbcf4055a667f51d9940a05e735e876cb7f50abfbf7de2a76364e135e
font_01_sfnt_off000088a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A8 10488 bytes
SHA-256: 9ab2c127a128d08486e07eabdd45b58d56b3c774d4100066828d5c2db6862896

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