Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a472ef673bab44…

MALICIOUS

PDF

46.1 KB Created: 2020-11-08 05:38:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: f75f9629fe059eaea29d9728091d8121 SHA-1: 83b4f2fbb6532932d61f8a6e1748c51afa7ea1a8 SHA-256: d1a472ef673bab441a75b6b45c9b0ec1f277071d6e097d4afe5195dbc780b728
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://traffset.ru/aws?keyword=answers+to+chemistry+the+central+science PDF link annotation
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/3250b5961ed1.pdfIn PDF document text
    • https://naligunuded.weebly.com/uploads/1/3/4/4/134472871/2200477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f9182665508a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_5f9d5db07b0a7.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/bd3665cd-6d12-4146-a848-44f2342d6f47/memupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56429380-89e4-4b96-b949-ba2d04f695a1/59361646131.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/87903872261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf01d2cb-b86e-478f-b67e-e8bf433ce55c/xozoruruju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c68145-21a5-4f6e-8698-f13a3652fd4c/free_printable_homeschool_teacher_planner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa12e373-680a-4092-a103-fd168d326b93/rakevurezoditim.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/nijovopisugatif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb41e2a1-a877-470c-914c-94409ac53eed/98843633542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b39a7bf-222b-45f8-bd01-929eb65c5517/76508376019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f22e3b85-c6c2-4b3d-9910-47fa62835d4f/84981623478.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_off00006963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6963 5008 bytes
SHA-256: f79576f8ed0e388c6c51f459d8b02378700162b8fc5cdc701d7a65f7c8cde0b1
font_01_sfnt_off00007a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3E 10248 bytes
SHA-256: a6506dedbb6b792381066d100dfb51df56535ddc9bb8bd6b133f288a40d5a8ea
font_02_sfnt_off00009d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D48 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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