Malicious PDF — malware analysis report

Static analysis result for SHA-256 7708d64e768680b3…

MALICIOUS

PDF

41.9 KB Created: 2020-11-06 03:39:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 481a4c1605abd69b7585cbbb3bf40730 SHA-1: e4f2839828b2a4b10017d542e93ffaa6f24e8932 SHA-256: 7708d64e768680b3aec9540459e2f3778f89f82f7bd795a44fb46cda81f4cba9
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://trafffi.ru/aws?keyword=rational+numbers+word+problems+worksheet+pdf PDF link annotation
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/5532825.pdfIn PDF document text
    • https://fadibukomu.weebly.com/uploads/1/3/4/3/134310842/xuposokugebitip-lupupaxo-pikogab-mizedejevoduno.pdfIn PDF document text
    • https://jexedijelewa.weebly.com/uploads/1/3/4/5/134518212/jifapoxalebisom.pdfIn PDF document text
    • https://kirimanadawa.weebly.com/uploads/1/3/4/3/134383910/zimeroxibig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_5fa07928b0012.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/62578dcd-cc1f-41f7-b771-f5c4e4193e84/cocoa_programming_for_mac_os_x_5th_e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c74a10c-4e8c-4057-8224-785a984e63d0/80511594360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97166ec5-6e0f-49d6-81a6-1d8c05b082f1/element_3d_1.6_crack_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff30724-ff73-4e03-964f-75210b4c8c04/figutodaruninamesimes.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_off00006153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6153 5584 bytes
SHA-256: f422bd5844f9bb311b791f1b7f29d6a60db79836bd6f03cb85315096f23c04d3
font_01_sfnt_off00007434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7434 11444 bytes
SHA-256: ef1d3e55cdf0d78174981cd7b8d1d06af30142733b9cee17b207754d33f50042