Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f9e676a2ce383b…

MALICIOUS

PDF

44.4 KB Created: 2020-11-05 22:07:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 58afcbab9ea3929e74bcf07b0d9535aa SHA-1: 1bab21b94fb16f7aa82f7b57264b08d09f8b04b8 SHA-256: e8f9e676a2ce383b0a9741491e7fb8bbe0bb305f359031dbfc37aeab38711151
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/strik?keyword=objective+type+of+test+pdf In PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/gikixurijajakovos.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://uploads.strikinglycdn.com/files/b26ff0bd-eaab-4459-abe3-7055fdab591d/xibozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2406a8f9-66ef-4fa3-95a4-d4935c77bf44/57941423027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88dddc53-bf7e-4633-a999-1cf2ec11e352/descargar_monster_inc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4436478-6141-42be-8064-de98159dff16/zaromap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea94ded4-5327-4e46-a0c2-c6e6e92fad19/89392338255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8adfe16a-1b35-4ace-b479-5e62d5ab3742/tajiwudivojajebajaguxab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/139121d7-1190-4b9d-90e9-1bca939be927/1212905837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9806c52c-128f-4059-83ca-c58369d689db/83501126293.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_off00006235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6235 4900 bytes
SHA-256: 3818ec24bd79cb3c2096356e024384ce21eb0c5e7d299f900162fc8e6d36ebd1
font_01_sfnt_off000072fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72FE 10704 bytes
SHA-256: 99a350b4388c73d3d8af447a8413e020320ba09f80d7268e09531f537664caec
font_02_sfnt_off00009750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9750 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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