Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4c3178f8fb4c8e…

MALICIOUS

PDF

45.6 KB Created: 2020-11-08 20:29:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 2f0462ece71d0b09be41b48142121306 SHA-1: cf42b448fdad92745ab871db9c7b623e80fee8e9 SHA-256: ff4c3178f8fb4c8e8b87a23c9c7213fa53116e2b33581bfe982cf626e7d80136
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?keyword=what+is+after+the+millennial PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5fa0b0d170982.pdfIn PDF document text
    • https://pesirirovozag.weebly.com/uploads/1/3/4/3/134316115/ad70d58b2eb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5f8e41812f1b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f877517aee7e.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/9ddab290b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_5fa4a9a17f87f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_5f8d15e42e229.pdfIn PDF document text
    • https://rofexigu.weebly.com/uploads/1/3/0/7/130738805/15bb762e86b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5fa09196ba5c7.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/4b12e562-2993-4d17-9d2d-3ec70ce8f5d5/79004485236.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_off0000730d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x730D 5020 bytes
SHA-256: a347105b82d31f6d80a2c291e363e529548965e23f6ca27e244bb9c5fcb3bca6
font_01_sfnt_off00008400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8400 11036 bytes
SHA-256: 9824865061db3635fddc67b4877bfcdeae9122e3ba9266aba4d3ce3248a60407