Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc03d03020e20cd3…

MALICIOUS

PDF

44.4 KB Created: 2020-11-07 00:35:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: d3aaab545b35c6ae16b3c55b4eb52f0e SHA-1: ca87737a8ace138f463ac3c831ec18df121f8c95 SHA-256: fc03d03020e20cd35e7b2bbb8324c33a2d09949a24bbb0619a8ba9d2dd5fb215
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://traffset.ru/aws?keyword=blank+clock+for+kids PDF link annotation
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/9625103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367927/normal_5f8df2638132b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_5fa5c7ee0024a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f8a4b2fc6b2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f8742d9b4a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421937/normal_5f9ea686a34d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376852/normal_5f8b04d7e029c.pdfIn PDF document text
    • https://kirewigofe.weebly.com/uploads/1/3/4/3/134382955/6689526.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/niwot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_5f9a1f3605544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f87c752ddc1d.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/3161b494-5a3e-43db-9ebb-13a1a17f20b7/bevelosuzebigurejiruzidi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e916f7cc-98e5-480b-9a2f-be31e48fe893/bozitavuxapulipeviz.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/12143876191.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_off0000703c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x703C 5128 bytes
SHA-256: f04fa711164b6c0c05aab4447ac7e41f0fca79404242070d66ee4dca008ea23e
font_01_sfnt_off000081bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81BF 10424 bytes
SHA-256: ef0f4ba90b23fe53d51f2d25b938bf77393f613901d2245774a03df1df3c28af