Malicious PDF — malware analysis report

Static analysis result for SHA-256 373a1c3e401a22d8…

MALICIOUS

PDF

39.0 KB Created: 2020-11-08 16:07:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: db6bc90154e86450392e2d963cba2a21 SHA-1: 9ebba549862a042c0b77ea60dc6291a9973c02a0 SHA-256: 373a1c3e401a22d828c0c4aa181ca2f96036ddb8e6e97cc8ebf4f61782143c5f
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://traffine.ru/123?keyword=areas+of+trapezoids+rhombuses+and+kites+11-2 In PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/6952638.pdfIn PDF document text
    • https://rizadubarezesul.weebly.com/uploads/1/3/4/4/134499036/5960006.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wisuw/18638320037.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/world_inventions_and_discoveries_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b0a3ba-464c-4a9a-bb81-19a20558f21c/gezut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86afb51-784b-4eeb-a15b-823ee3b8952a/71177950602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b02a98-e54a-4173-a885-bbaf4e9934a8/3406444730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71cceb9a-9a24-4965-9c4f-3a1a74007a20/behold_the_dreamers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cbd8335-d4e8-4632-8d00-d6f4d552273d/38963159044.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/battle_of_the_books_alaska_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/jagepabebobigafivav.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/rodegexoduvusegizetozufew.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/comment_assembler_2_en_1_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/beronejefipok.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/bagepavotarezamediko.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_off000051a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51A3 1720 bytes
SHA-256: 6546d68f500b9e82a16bda3ee730345bdbe5281aaacd9b9b8084cd6a2e2cfc82
font_01_sfnt_off00005a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A13 5708 bytes
SHA-256: bfc91b5218b92504850a5ad4dfe089af0b93ef92b77e97d23f32f2db5edcde3a
font_02_sfnt_off00006d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5C 9724 bytes
SHA-256: 4e081d600de7fd005db2cdfbef874c054ea0d661d44f0a9def32289a3288350b

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