Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1a55e3d7b35b5d…

MALICIOUS

PDF

42.0 KB Created: 2020-10-02 05:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4e2bb53c91837c2777eebf06bc64ad03 SHA-1: 7f170116adc435cc7b5e9d7e9f75ff6b24cc6045 SHA-256: fb1a55e3d7b35b5daf82fe891998225dfba3276912887e4868c24f3d573bbe88
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=true+or+false+exercise In PDF document text
    • http://files.davidbateswriter.com/uploads/1/3/1/8/131871780/310dbe6798c.pdfIn PDF document text
    • http://jupozon.myprovidenceconstruction.com/uploads/1/3/1/4/131454899/maxufozekiweras_girepimawigig.pdfIn PDF document text
    • http://tegekuje.decisionskills.com/uploads/1/3/1/4/131409909/kefesivuxu_pezepezesegi.pdfIn PDF document text
    • http://files.amnestyhouston.org/uploads/1/3/0/7/130775652/c73dba6da85.pdfIn PDF document text
    • http://files.buildprinting.com/uploads/1/3/2/7/132712234/zezaj-nusesisuji.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/dabc1660-21bb-4fb9-8d81-5075a6a50dc8/zanororivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b8e7cd-7d9a-4e2c-831b-91677fe9b7ad/siwadopogelidumapumedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95df25d-cd15-409c-909a-90e12ae4a06b/rowuterifotin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5182e14e-f04f-4b3b-b4ee-874431b45ad0/fagozimumilimab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e50012-e691-4932-8e15-790498a90467/bikigubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e63b8bea-6975-42a6-9d09-1fec0d481d13/39073543412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da52aa19-c38b-4ff5-bfa2-9bbbbe0800d2/bawuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a9a224-bb26-48b9-8a2f-c30c66e0120a/papuludekowironexem.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6808 4892 bytes
SHA-256: f4ac99a03a1766386405222296a9cfef745bda3a66aa10c6941b137f4809b9e0
font_01_sfnt_off000078be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78BE 10196 bytes
SHA-256: e188f9370cb7f441b2e00ecbdc462c78f6c6e696b6db6131b5eefb99294b203d

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