Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0b19606eb5775b…

MALICIOUS

PDF

34.2 KB Created: 2020-11-09 12:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 2fcce5238da8fec494a789eeec63d7f4 SHA-1: 8d677600bc57ad2f033a64f0bf9db336bfbd24fc SHA-256: df0b19606eb5775bbf9e26627d65152ffd5b92e34f4c09ed46cab5b85c699f08
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://trafffe.ru/aws?keyword=abiotic+and+biotic+worksheet+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375073/normal_5fa6df7aaf1e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450501/normal_5fa0e9e96a6d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426558/normal_5f998fa09a715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_5fa22fb429868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427820/normal_5fa769d32e537.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392658/normal_5f9e598f72eb9.pdfIn PDF document text
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/1e6340157e2a.pdfIn PDF document text
    • https://fumunagik.weebly.com/uploads/1/3/4/5/134520136/lesorosa.pdfIn PDF document text
    • https://sorefikope.weebly.com/uploads/1/3/4/6/134664591/folipigazozag_gibajuv_zudaguga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f93e8918f20e.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/64561474-e819-4a08-874a-3245d561e82b/46284931193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43fbd2b-27df-43a2-9dfe-a4f2c2acde2b/who_knows_mommy_best_printable_template.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_off00004764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4764 5364 bytes
SHA-256: b5ef7489d9860bca7fd0b384439b514054141b292f7ef019cdb6d9507f095d55
font_01_sfnt_off000059b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59B0 10132 bytes
SHA-256: cf40e85b7eecbd4b2a444885da42624dd2159a852244354b0ee10a49a0732977