Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09b9cf7fc277233…

MALICIOUS

PDF

44.9 KB Created: 2020-10-07 02:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 5db58ab46702b0b9b47580674474cbce SHA-1: 320bbb50367624636a708f15c44361a21d955bf3 SHA-256: b09b9cf7fc277233d523f16e2707e379fe66c6f578b0bf916a5df0a3e983ee16
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=agenda+docente+2020+pdf+gratis+argentina In PDF document text
    • http://files.martin-hickman.com/uploads/1/3/0/7/130738666/225b174f.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/6402c57d-5137-42c3-86df-08c1d2651ff5/nifepuzijenaxibapima.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec762430-7b5f-42fa-bb57-765812a0a80e/dimemigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64da986e-05e4-4b96-ae46-e71b318e9d88/dafoxeposojawofodok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0eb6451f-00ab-4144-8a20-e3b9026acb44/23230733645.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0688/5027/files/flash_2020_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3133/4559/files/61208472730.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5608/7708/files/gifitederofibevasazuvur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3238/2110/files/mountain_river_handicraft_incense_holder_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0070/8765/files/mcfarland_usa_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0497/2184/files/changing_address_on_license_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9030/3389/files/73029984970.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_off00006df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF1 5556 bytes
SHA-256: 51684c57a89fe215ad3f1fc5ae0fb0197e3805bbc88ba935cc7b890cde718f80
font_01_sfnt_off000080f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80F2 10968 bytes
SHA-256: a3d34d1dd3da264d28f1b3cef21b1b783a2e8e2ba8671efc9c5a74eb9c9ec227