Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9a8edaa5c6c43a…

MALICIOUS

PDF

37.6 KB Created: 2020-11-07 08:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 841bfdc1c793fe46091b3cd8b89c4ff4 SHA-1: b04c2882ec06667918056487df2b7386b6b11158 SHA-256: 1f9a8edaa5c6c43a5ea6bda2432c51fc29d14f4ece16daa7b9b0a70a74623a93
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafficel.ru/aws?keyword=el+dorado+springs+school+district PDF link annotation
    • https://kisuguwaki.weebly.com/uploads/1/3/4/3/134388310/6383873.pdfIn PDF document text
    • https://rizulibix.weebly.com/uploads/1/3/4/3/134358491/zavukiluvumozat_xivujiz_tumimilaba.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/4768722.pdfIn PDF document text
    • https://gasipepimajut.weebly.com/uploads/1/3/4/3/134367512/931d344d.pdfIn PDF document text
    • https://xozagalan.weebly.com/uploads/1/3/4/5/134519104/wavawer_pexipuwog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://pazeden.files.wordpress.com/2020/11/5129525431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12dfa743-5831-4eb9-ba9e-ba00263dd85d/52799040005.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/merge_files_with_acrobat_reader.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/67532979749.pdfIn PDF document text
    • https://tosigipagop.files.wordpress.com/2020/11/ejercicios_de_series_numericas_para.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/king_county_surface_water_design_manual_2009.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/fulinuduvejapozexax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4830 4964 bytes
SHA-256: f201e2ec11917fcf3afc6c7616d7a7d662ebfda00b442df1750d154cade29192
font_01_sfnt_off000058fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58FD 10200 bytes
SHA-256: 6eed3479878cf8fb22da1e0531807111581106afa94b699db7c6329ff9fa06c2
font_02_sfnt_off00007b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B8E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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