Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a6e9a17b4e4cbc…

MALICIOUS

PDF

42.8 KB Created: 2020-11-06 03:43:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 317aa21e6010e283f32db16eb337e615 SHA-1: e503b7fabcc0553bbad8d9e615576e7f77e5f8b0 SHA-256: 25a6e9a17b4e4cbc405efacd4123d4aba56a6eea29076cd46c8b6971daa47b33
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://traffking.ru/123?keyword=triangle+inequalities+worksheet+kuta In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408701/normal_5f9ec939a4141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_5fa06b66c5d82.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/zepux-zidaru.pdfIn PDF document text
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/4194684.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/gojuzinabebe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/71930801867.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/facebook_lite_apk_download_windows_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/jixalefexemopinipa.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/beginner_electric_guitar_lessons.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/zavofanepofizesekuxemo.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/veragitajobutilibofewop.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_off00006962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6962 5176 bytes
SHA-256: 7755eacb1785ce4d4c6864b5d537140e4ffcc565e8c8dd8699a9f1e1ef1dd17c
font_01_sfnt_off00007b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B07 10512 bytes
SHA-256: 7ad4b6b3c88088505303443a095c7bec1360731f3a4e023164be261657e32376