Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d7e09168d22c1e…

MALICIOUS

PDF

41.6 KB Created: 2020-10-05 19:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 5be50c4dc0ff293e442bdce397c50165 SHA-1: 5e654c31c6dd594778372fd085bcae1e6375fc09 SHA-256: 91d7e09168d22c1eb4edfe873dbf41dc774ffce84eccc2ead5aed751e30e14b4
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://cctraff.ru/strik?keyword=evaluative+questions+examples In PDF document text
    • https://site-1037881.mozfiles.com/files/1037881/jawokimozifejigexurazib.pdfIn PDF document text
    • https://site-1042978.mozfiles.com/files/1042978/76072281703.pdfIn PDF document text
    • http://files.firecrackersgibson.com/uploads/1/3/2/6/132681392/rodepaji.pdfIn PDF document text
    • http://lakik.saratogatalent.com/uploads/1/3/0/9/130969858/jowiviwopile.pdfIn PDF document text
    • http://tuter.glenforestpsychological.com/uploads/1/3/0/7/130776023/ronisedusodib-lijolene.pdfIn PDF document text
    • http://files.physiotherapyassociates.co.uk/uploads/1/3/1/6/131606268/fegagobupuru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1721/4874/files/7054548032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1128/2843/files/zikenuwegotak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/driver_detectiv_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/81200776526.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/3882/1530/files/1073802025.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2623/6071/files/nagak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/jedipuvilen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4207/3507/files/american_airlines_airbus_a319_first_class.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7631/1447/files/28136803545.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/3338/3071/files/81470608324.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_off00006519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6519 5080 bytes
SHA-256: 4e0a05dbf5eae270888c6ff4088612ea6a06a5e16fd8007f47082041322f56ef
font_01_sfnt_off00007668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7668 10472 bytes
SHA-256: a333640b816d17b9a0f58c295032a6da3115d2bf4d53cae71a2359644a514c0d

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