Malicious PDF — malware analysis report

Static analysis result for SHA-256 5628957fa3600a13…

MALICIOUS

PDF

56.3 KB Created: 2020-10-10 20:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 2408befa40c30e70bd60b9e28904bdca SHA-1: fe8570509d0fc8e307b82e5b6b6c0cc409ecaa9b SHA-256: 5628957fa3600a13fbfce961685fbaeffe76433eb912bf6478f0013801776f7f
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=darby+dispensational+theology In PDF document text
    • http://duwutil.providence-ca.org/uploads/1/3/1/4/131437532/9a610f9e65a.pdfIn PDF document text
    • http://gepak.decadeofpeace.com/uploads/1/3/1/6/131606457/3549014.pdfIn PDF document text
    • http://fuletub.trinitywellnesscharleston.com/uploads/1/3/0/9/130969525/mobotumape.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/f0c669f5-5784-4eda-a312-9c2ffbf716c6/bibawowisawigugogubisuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c82a4a57-7462-413a-bf47-287caa0ad575/15112493695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/728fcf28-d9f2-4003-8842-c60a4c816f1f/libonemezutivelokoriton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46cfcd70-27d9-47ad-9868-371bbfc37325/jelizazuxori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edfe2549-10aa-4431-8261-e8398612e033/44021680250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52b3fd9-3834-423d-8165-3f4b3d19bf7a/patilevarasajoraso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1392/9122/files/pepipitomefu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7504/7066/files/volibufokajodunalebabo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6214/8763/files/21059274248.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7371/0501/files/rotaxulojafamim.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_off00009ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EA5 5464 bytes
SHA-256: 5ad5c5b9436fac6d8a6c7540d0899736122efc07aaf170f1856040ed8f054172
font_01_sfnt_off0000b139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB139 10208 bytes
SHA-256: 4dc078726d43e73925ecc927a849f6a35a49560d27256fd8c8cd350156320b97

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