Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23c4f76d430bc42…

MALICIOUS

PDF

63.3 KB Created: 2020-10-17 12:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 9b272bafbd1353b00d45b17f5c6141d7 SHA-1: 3ab1819a6cde18ba40404a28227e175db2f40a57 SHA-256: f23c4f76d430bc42045dd21097715e9b8d980f54e981099afd4b28e9bbe2f30c
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=ib+diploma+maths+hl+formula+booklet In PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/038885c85ecf8f0.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/rizizovidonaxa.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/7098927.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/8763212.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/vigirupiruwovilav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f8a70237de41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372980/normal_5f88fcd95fd46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f87651349250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f889ba24fc34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f881aa6651cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5f88fea7c7a33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_5f8aaec8739e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367916/normal_5f89793821093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_5f87590f04012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f87f45b69830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372376/normal_5f8a8627d9f12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f876626cfcef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f88aecbd1bbc.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/f55e732d-1c53-4e97-a42c-e7b783a2cf29/xaxox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00757c03-95a6-4eaf-8dbd-0a649683d59a/89900838289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aefc4fc-4d59-4f61-9015-7226f6943051/tirivokibupetufem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07eee29a-e587-4b98-8776-3b315003bd28/13168839791.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC4 1808 bytes
SHA-256: 3720bdcefeda511cccd4e5eee4a93fada2c97b0defe3457c43b8180147572472
font_01_sfnt_off00008674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8674 5420 bytes
SHA-256: 298e4a2f5f99b896784c550f89f012fa225d1273f4265919f8844752de600b37
font_02_sfnt_off000098aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98AA 2256 bytes
SHA-256: e6a15d5bf2490199b6b7e4bfb105d4f115610ec4b347ea7ee26a0c155bc19b19
font_03_sfnt_off0000a230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA230 16932 bytes
SHA-256: c71f66f3d9f6b108e30b1b96c6bf7b0f5beafb938ab525ab1341e05034128d8c
font_04_sfnt_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 16308 bytes
SHA-256: 503c8fab79673a439740f8b9a8c37ad9c917710667557ad09d179e3cd097bb3b