Malicious PDF — malware analysis report

Static analysis result for SHA-256 b651da2219c4f0c7…

MALICIOUS

PDF

43.4 KB Created: 2020-10-25 22:31:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 199feb9f7b44da8004ba027f36ebbde0 SHA-1: 9b9e6cbc5c35ed9e90e5140de95becc6aad75e86 SHA-256: b651da2219c4f0c728d80cfebd62afe396ebbc29673a1ec5582b043433eb7b66
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://ggtraff.ru/aws?keyword=bsc+mathematics+question+paper+pdf In PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/vewafunenefop-saseguvad-bujutozigite-nibajusad.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/3b11b222f.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/3770932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5f871508e9b7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5f8aa315db909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_5f93bee805f74.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/91850135-a783-4334-aa95-7358e551236a/jewexinabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65a03f87-c257-4874-acc3-a208a3162e0f/37427567804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1f8204-64ab-43e6-bb8f-0e80fd935edc/dalatiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2723b51d-f759-45a5-a565-888f80dcb7b9/43165286089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e348ac-d7b9-4e34-9c94-435f9cab36d2/36518187532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d529ee-7a97-4fb0-8efe-4edbeae1df60/james_taylor_sweet_baby_james_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c854f12c-f53c-45f1-a6b6-19e9bd9ed756/26679012925.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c400b73f-208e-4ae8-9c4d-bcb339c02545/lt_49ma875_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d09be8a7-8698-422d-a3b2-2fee7b770723/zoxuxitaforabazivoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d5f4bf0-94be-4d01-8b35-1e649555db91/8588201842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3be7692-dfd2-45ba-ba32-4f1c8ab46079/visavikebefekidarerugenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bd6c00-2933-4af2-8867-ce7a7be77a92/80435333006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe71ca10-7ba4-4ec6-8769-570675263628/90_days_to_sight_reading_success.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be7f89a5-b209-412c-a5fb-f2a504973f1b/folovuvigul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87877757-0c23-4fab-8bd7-561d8bb46305/kegudamederakorenolub.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_off00005de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE4 3120 bytes
SHA-256: 16a0685b1af8f7ff3286410c82d065b2ef9dd16f5cc5e004aadb0dd239daad33
font_01_sfnt_off00006917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6917 5540 bytes
SHA-256: 35f42bd84e428466483f893739288d015ea79c559e27c559d2ebde6a52c25b8d
font_02_sfnt_off00007bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBC 11252 bytes
SHA-256: fec154d9be80560997b88dcab53aad4554bb5cc2559cf95d03d6209b4f362a53