Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd703dde4f7d36c…

MALICIOUS

PDF

39.5 KB Created: 2020-11-08 07:59:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: a6027af5ad12517ba4260959d2c31b73 SHA-1: a54aed9507873a3110bdff5cee4509741186aa4e SHA-256: 4dd703dde4f7d36c6147c3e3d0addd284c2b42055e0997890b94629e976d78a3
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/aws?keyword=tattoo+coloring+books+for+adults PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414353/normal_5f9cc67c0a5a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383924/normal_5f95acb2e9a64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379726/normal_5f8dc1674bbe9.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/2a3ef15f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376096/normal_5f8c28d5e1f2c.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/2307136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_5f91949c81b15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_5f9a7a9853a56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_5f977bb590770.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/navoburarovada/kuxogubirefepogikivitifa.pdfIn PDF document text
    • https://midaxexiw.files.wordpress.com/2020/11/extraordinary_acupuncture_points_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/39183893169.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_off00005d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D13 5344 bytes
SHA-256: 1176ee8b77328199df637edf6974bc8785e2d47638e0752ed69c49a1e7d24d45
font_01_sfnt_off00006f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4B 10024 bytes
SHA-256: 73d8ab526a517fe379d55b16516fd2273c474d33c9de407e8604689cb83f433a