Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c0fc8ef0c13388…

MALICIOUS

PDF

39.1 KB Created: 2020-11-09 17:07:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 82be4e0711f354f6de68469e67320306 SHA-1: 488954f63228778498e685ed37c1ad9bde687c52 SHA-256: b4c0fc8ef0c133884d8bb9ee08200f9015a9f86b6dae229f3ffb7844b6078bf7
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=guardian+technology+component PDF link annotation
    • https://bokixewabukogu.weebly.com/uploads/1/3/4/3/134341992/bijareb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_5f91f5628ebcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_5f98c07bd02b6.pdfIn PDF document text
    • https://numurivigafezu.weebly.com/uploads/1/3/4/3/134390613/1971629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420745/normal_5f9fc77ea30ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f8735ae6bbf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_5fa12571dc1c8.pdfIn PDF document text
    • https://wurikosaradusif.weebly.com/uploads/1/3/1/3/131384544/a273278.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_5f8e052ecce90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f8b5d1586503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f91c5110f167.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/suxelujaxosi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411491/normal_5f9a648ba4825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5f8c64e5f2423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414486/normal_5f98a7608e6ad.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/tevuwewogoka-fomikopomeg-nuximowa-zovavanivazibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A11 5444 bytes
SHA-256: 01b9462289c3c874021798bbd6b670d57d0d81cb8836eb9576de52339b8bad9c
font_01_sfnt_off00006c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C73 10296 bytes
SHA-256: 0a541de5d149a5a5c602d60bd15b3a1c956f55b02c6f16416908bed00e12eaac