Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c5abe4f8513272d…

MALICIOUS

PDF

40.7 KB Created: 2020-10-23 03:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 0f906426431a1244f6a525300eda7982 SHA-1: b0b93f6b0f455bd9e34965a22cc170d68e9c64aa SHA-256: 3c5abe4f8513272d5405ead9b0e5c5cff4d1d0531c2613ba9e63653d42f0815c
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=fundamentos+de+la+economia+silvestre+mendez In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5f8de79dce12c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_5f89948a70d15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_5f892f81ed812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f875e4c1ba25.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/31fee7c.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/tubep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bojafazes/tavivatifapuwagadibepukaf.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/actinomycetes_classification.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/vavadudevujed.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/modujukupavupozulo.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/93563025339.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/be_with_you_city_harvest_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/66862022003.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/phenylketonuria_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/asme_b31_3_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/exercicios_resolvidos_sobre_associao_de_resistores.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/panikejuterobapuviz.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/35769709706.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/booklet_layout_design.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/18825573440.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/cognitive_behavioural_therapy_for_ocd.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/12990266093.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/vilasikumobimaviguv.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_off00005ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC2 5148 bytes
SHA-256: 3c91dcd74895deaae3d1cb12fe64b5b240622fba700b9bd43979fdbd0ef6699b
font_01_sfnt_off00006c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3A 12316 bytes
SHA-256: db1b5269570778489fd7989222a03b0f6eb63079828ed51f69a8c9eec5b7c55a

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