Malicious PDF — malware analysis report

Static analysis result for SHA-256 668cbea2c66e8e6f…

MALICIOUS

PDF

42.6 KB Created: 2020-11-06 13:42:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a06c7e6eb774c83f455f89bb91a57169 SHA-1: e4720778a9a797e70b3cf2b08f7bc47c2e352406 SHA-256: 668cbea2c66e8e6f489e5870080dbe6eaf85b0da1d3653ee0da964a8af45100b
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://traffset.ru/strik?keyword=redeem+code+for+minecraft+java+edition PDF link annotation
    • https://sivivaleretuvu.weebly.com/uploads/1/3/4/3/134324596/5de2a70e8f3.pdfIn PDF document text
    • https://depoferi.weebly.com/uploads/1/3/4/4/134445349/3837413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_5f92998dc84ab.pdfIn PDF document text
    • https://bepugodaz.weebly.com/uploads/1/3/4/2/134236138/570974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_5f9fc1c331543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5fa466f14e4cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_5f942a5fdb274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_5f8eb2c6aa2c8.pdfIn PDF document text
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/e738186835.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/retisovojor/2138507702.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/benim_hocam_ales_matematik.pdfIn PDF document text
    • https://s3.amazonaws.com/mokavilez/ucla_math_31a_syllabus.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_off00006875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6875 5100 bytes
SHA-256: ab0349b50878a93537dbb784bc8b4da3e4b89457ba8cf58ebd1f13ca818f4537
font_01_sfnt_off000079cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79CC 10572 bytes
SHA-256: 35043a5931b20e551a32cd887163210930a7d1baf46d737bac3537a047e27d33