Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0dd45267fdac53…

MALICIOUS

PDF

62.5 KB Created: 2020-11-11 00:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 05b76c897561b350d945b336a026e728 SHA-1: 2bd92a5e66cd3792e646536be96be11f9c659ef8 SHA-256: 1a0dd45267fdac532eca8148f7f76c53a353ee5cb228d98fbd4347305fed8374
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/aws?keyword=bedford+memorial+school+nh PDF link annotation
    • https://zukinubugepar.weebly.com/uploads/1/3/4/5/134514864/6803717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387412/normal_5f93d291e26b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_5f8d07714fb01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393772/normal_5fa09dc5701d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_5f9265630c95f.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/4d0de9fd-d5c6-4ecf-ba30-f9888d484db4/33134795328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b44f833-7f8d-42a0-8072-cd367fd1e48e/56844775006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/755058b2-8d8b-47f8-a5bb-def34555f467/jesawisopiwivowusipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871e1d2e-7fff-4a74-b38e-1691eebec85e/hall_and_knight_higher_algebra_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75497ebf-67bd-4650-9c16-c994cc412e4d/technics_sh_8017_manual.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_off0000b7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E3 5308 bytes
SHA-256: cd32c2cfaedc09aa0436e213da98ba5b7d690302b6ad6abce51f308005726530
font_01_sfnt_off0000c9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C4 10544 bytes
SHA-256: afc5db78ba5c5222d394c368c95e369de506298ceb297dbe5b85f96de257d362