Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc57b59877856526…

MALICIOUS

PDF

34.9 KB Created: 2020-11-08 01:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 04621c235f5ae6b94c1b94319e15c9da SHA-1: 4d7b7d7d37e11fb935a40f894e943f7f9fa8faed SHA-256: cc57b598778565266672e18f975bfaed5d9989c19e1b653893b0c56f4d34e982
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://trafffe.ru/123?keyword=nothing+but+the+truth+chapter+6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371498/normal_5f91a4dc2279d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f8fee6875e72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5f88399e447d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f8aac374f156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387056/normal_5f91f2e58da88.pdfIn PDF document text
    • https://kololeranazi.weebly.com/uploads/1/3/4/5/134583506/matafir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_5f966461570da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lupebesu/7754523776.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/freddi_the_fish_computer_game.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F67 5128 bytes
SHA-256: b6c54bf35674d7d97c8376500919315a17812e4324f1b7a2bf37bc41a41e72a4
font_01_sfnt_off000050d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50D4 9428 bytes
SHA-256: 080f81f63a34b18bad2badd85a1a83f60daa3418a9e50fc6466d3b91a3b6312b
font_02_sfnt_off00007117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7117 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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