Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b3264e64c9df6e…

MALICIOUS

PDF

41.4 KB Created: 2020-10-14 09:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: fd005a98b75579b0184c4d2394ccc483 SHA-1: 329a1647fe12927827cabed383898d5da765ef83 SHA-256: 08b3264e64c9df6ef21dbb8883a169b04fc609177fcd128f0e8543d26594db3d
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://gettraff.ru/strik?keyword=karyotyping+activity+pdf+answers In PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/domovodibaposix.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/sokilijaw.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/f27d0645-76d6-40f2-99bd-97e7e92513e9/bezebapoxefufupurifupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01857337-3b4e-4307-b8c5-0a634ee75ec7/18757050739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d0e758-24b1-4347-a0f1-5d796e041907/panuligetirager.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2435/0375/files/87314549078.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/97177168271.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2077/1750/files/92360610241.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/1478/7740/files/fourth_step_inventory_resentments.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7857/3468/files/11943601983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7a95ba-1276-46d8-8862-cd95fc92a9ed/nimuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b35363-1d7f-48e7-9854-5c426a944482/88294946838.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_off0000633c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x633C 5512 bytes
SHA-256: b8b706e0c413378aa2d4e35cb59537b989cb14d79fd94b4c4db48015d5339e9b
font_01_sfnt_off0000762e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x762E 10144 bytes
SHA-256: b62b1468827e7209f9b8e055c0d19cf5c02c9c451f34c77f1b0bea976ac025eb