Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d18398b255d3dc6…

MALICIOUS

PDF

42.0 KB Created: 2020-10-16 11:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4b4574561f887c8c3cfb0790e118a817 SHA-1: fd986d4c3537d7b17815a5b3865ae45fac902af6 SHA-256: 8d18398b255d3dc6963883824e8aad8b50581396cd0a5035ac9ee2ef76368847
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://ggtraff.ru/123?keyword=subject+pronouns+worksheet+1+answers In PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/b34e989.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/rimamesule_zutizeb_ganegojizenom.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/ed687858-a00d-4275-8977-35e4e238663d/91265976283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f2bc31c-2213-4d44-8c4b-c126161b9a85/bukafapugarudibokil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7716f8f7-cb14-41c0-8fab-a56428a7532a/suxavuzowoxebum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/857dbf0c-67ba-4754-9337-a667feb6a96d/95240276539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a299bfc2-923a-4577-8c0e-63ce305312fa/wasuxusosawirutunifunodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/777f8be5-059f-4f72-8a72-85b0a157fdaa/6444363625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/429a00c0-cc51-49ff-88ff-e81f4117ccaf/68336865092.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8111145-63f8-40b9-86a2-db623087c55a/janusuguzapanalarizefome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db2af6da-606f-4535-8791-8ffc0b153521/99892111702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa9f4ce-fcfb-408d-946f-451681a8a41c/tekukatufijorasifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf6c0d1-5c8e-46fe-8bc5-a38a7745fad9/gofodafatomizek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8673a408-fe79-4438-94d5-0daaa11853ed/36845214052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9990794a-f325-40cf-be27-343fea7d70d7/54085558447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/138f2a73-610f-4f67-b6b9-f7849386dc02/24362843902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3abb3adc-c064-4cdf-a2ed-1a4fc6c27c01/bibuxelabipafolariduposo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc902451-8631-4931-bc11-7595f69e3cf4/47156609602.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_off000066f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F8 5516 bytes
SHA-256: a9feee2bc61d60c55f903266abc5d0cfc6094db1da4bd57f6a46071af890e8be
font_01_sfnt_off000079cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79CD 9780 bytes
SHA-256: 8c013d63f46eab1049f8677067b7924085d7fc079e5784f5e203ba32e8c937cd

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