Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f596e9673efeaf…

MALICIOUS

PDF

39.4 KB Created: 2020-11-09 09:02:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 1266734dfe7597236792767ad91148aa SHA-1: 020cc8757055225302cfe23ee2609ae55ebcadf5 SHA-256: 75f596e9673efeaf506b585890861fd4af44d78950b113b64d2d52a830c0f26b
216 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 8

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://trafffi.ru/aws?keyword=google+drive+interstellar PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414498/normal_5fa6a4d7d6d76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5fa1a0c04324b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f8703f10c1b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5f899d55760ac.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/fazuvobobusomevoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5fa08073bafbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_5fa7b4239560c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/hacking_exposed_7.pdfIn PDF document text
    • https://vabavoresadi.files.wordpress.com/2020/11/debewasomogoro.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/2075422304.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_off00005ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE2 5084 bytes
SHA-256: b88cbf4eb63934332723eabb9a5f4bf674215321ceae9dbf7a5ddecd128d2c36
font_01_sfnt_off00006e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E47 10236 bytes
SHA-256: f3c849dcf91fe4b762489977a3385a18b4fa2b958aaa8f2cb5b31b510efa8067