Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd603bcbd2ff705f…

MALICIOUS

PDF

43.2 KB Created: 2020-11-09 06:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: c83d1176c62e9423047a47451a15c65d SHA-1: c24f909281d0791acd899c9220d1b077deed396a SHA-256: cd603bcbd2ff705f060c2bebbf59d6467a16d331774c4c5a8ecee73129c21ec3
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://trafftec.ru/aws?keyword=bulk+flip+flops+unisex PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f8736fd74ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403414/normal_5f9a5c5e27355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_5f8c7dc42120b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5fa89e3f94528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450519/normal_5fa2fb62f23c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370746/normal_5f894188a96be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_5f97b57e45857.pdfIn PDF document text
    • https://dotigima.weebly.com/uploads/1/3/4/4/134404546/funumuravilubixeru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f878093a7f5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f87396a74ebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421038/normal_5f9674e452526.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/tobobowu/minecraft_change_biome_type.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/zuzukajamipojofalonuxubi.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_off00005fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCF 4572 bytes
SHA-256: 8b1cf870245b0f8fa2da3ef5a969f83cd32f326d2bce0a185a219e16b6e48543
font_01_sfnt_off00006f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6D 10232 bytes
SHA-256: f0fb167bfdc25cffe4418fde3dabe27cc7c2538479832da0489eb86bda8cb13c
font_02_sfnt_off00009271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9271 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f