Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e607ba258be531e…

MALICIOUS

PDF

44.0 KB Created: 2020-10-03 08:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3c9563bd76a67170d695c5ba03d10a51 SHA-1: 400ba5b70ebd08271a199f9451a2efabe08abd51 SHA-256: 0e607ba258be531e8a27e705ab64260a43415abb5c1a8ca98ffed5abce32becd
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=adjectif+possessif+anglais+exercice+pdf In PDF document text
    • http://files.winchester-landtrust.org/uploads/1/3/1/3/131379060/kadalatijakus.pdfIn PDF document text
    • http://files.whatnotservices.com/uploads/1/3/1/4/131438353/wevedopomonixat_pibat.pdfIn PDF document text
    • http://files.dcaaems.org/uploads/1/3/2/6/132681409/xomadujilafar-rejedikixegum-detepiku-regoteza.pdfIn PDF document text
    • http://files.chiminisiberians.com/uploads/1/3/0/9/130968956/wawuzawibuweru_bopulus.pdfIn PDF document text
    • http://files.thecabinetart.com/uploads/1/3/2/6/132682790/lunepanu.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/634b553c-49ea-4834-9a54-dd8db205fae0/fiwax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c4c1d9-28b2-42e7-9652-db4934115986/6885062111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788c6db7-3d2c-4556-98f5-d2ec7915aa6d/38371384066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20226234-0c09-4ec7-9ddb-aba08386d50d/83013819218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed8ca2e-8b3d-47a3-b6ed-da3848a544f9/4968690751.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8817a20-762b-4df9-b27c-82e615140591/37770650673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad248e52-209a-4d03-a698-532ce7ef89fe/93871786851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32cce0ea-aeb9-4e48-be87-7556dd94762d/82687756532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31b5650-885f-4405-ad5e-da630a0c8e6a/49037297201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/205e25ec-dcc7-4fa0-910a-5e2838061814/ralekoxivifiwipenawiruli.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_off00006910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6910 5456 bytes
SHA-256: 1a44d55011d3178341096ba18fb5c4d87d46afe068e9ec108d58b1e0f11ac8e8
font_01_sfnt_off00007bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBF 12048 bytes
SHA-256: 9940ab48f4ba5d8302c7c78e8459436899a0ff3f252b71c3aa80be8faa5766cd

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