Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf1630adab91845…

MALICIOUS

PDF

52.1 KB Created: 2020-11-07 15:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: d3805c26127fa7b839363b116c891690 SHA-1: 27aa2d4229448ea2e4f1cc0df43ed80c4b7675cf SHA-256: 9bf1630adab91845b2283428eeca765a9d6ba19caf6af8dfbc071eaaf97a266f
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://traffking.ru/123?keyword=lab+7+the+ballistic+pendulum In PDF document text
    • https://nilijinaxobizag.weebly.com/uploads/1/3/4/3/134356504/3774649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_5f98028ed4649.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://botebofeji.files.wordpress.com/2020/11/15963812645.pdfIn PDF document text
    • https://tijuped.files.wordpress.com/2020/11/sopa_de_letras_elementos_quimicos.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/42760907822.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/jungle_m_biome_id.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/woselepirijinefumexilamol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e393a8a-a125-41ff-8bf8-59f8cf45dc14/biology_grade_12_khmer.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/8906017305.pdfIn PDF document text
    • https://vipuvixo.files.wordpress.com/2020/11/nojanum.pdfIn PDF document text
    • https://ragejaso.files.wordpress.com/2020/11/molecular_biology_of_the_cell_the_problems_book_sixth_edition_solutions.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_off00008c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C20 5380 bytes
SHA-256: df239b28f13f63588bd24fc79f4297bb640916fd7bf718fcb7a6c7d115363aa8
font_01_sfnt_off00009e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E48 10956 bytes
SHA-256: 36e1f6ca117d379c839d595240995a2ba9da7e00e40bd1fb16f0ae38470de2e7