Malicious PDF — malware analysis report

Static analysis result for SHA-256 227c061be21c261e…

MALICIOUS

PDF

40.4 KB Created: 2020-10-18 00:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1c4125e2077864a4953770664332b0aa SHA-1: d08d28f056f0ba3b4c26d3b59604b938af57ec82 SHA-256: 227c061be21c261e9db8ff69b39ceadd17591d28d4b4abf8e6c53de33ac69e95
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/123?keyword=the+three+theban+plays+pdf+robert+fagles In PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/danusetixoxagoje.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/498345.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/7040516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f8b688804379.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f8924c25d003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f872343bc043.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f8b66738ab4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5f8b62510c8e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f876d384c15e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5f8a5ab60191a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_5f872612a08a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f8714b07cd59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5f8975ae90c7f.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/644da438-bf87-4cf4-89c4-9e2a08b06391/lojevarufelosolerimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c0b388f-315a-441f-8a21-23ebe97f062d/49588592979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0494ae8-85d6-4520-940a-b4f7a601fdb3/pazizolorosutekipetixux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/530546ed-3161-4dad-b28a-1a5f4bcc9d4c/44771821868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e484c075-f426-4e31-a0b5-2878f8eb5143/niduja.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_off00006098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6098 5492 bytes
SHA-256: 86b1584b5d7d292c5dff986092fc0c3f9f09b967bfca87e560f431ccea7b64cd
font_01_sfnt_off00007340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7340 9732 bytes
SHA-256: 5f424734487bf261a158632126d328c897b5f3c225799c4cecc2f507443d7fb6

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