Malicious PDF — malware analysis report

Static analysis result for SHA-256 df76cce109a4020a…

MALICIOUS

PDF

49.4 KB Created: 2020-10-14 11:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 5a3d41b1d5e9886b6e48f0e7500e3fef SHA-1: df8e033bf94f0fa884ad5d3317186c80d9ba6b9a SHA-256: df76cce109a4020a116e5bd4343ada2e56c25a0a80254d6fdef5c4e2ae4e44e4
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=vertebrate+zoology+books+pdf+free+download In PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/digokasawuj-jipamuputevuf.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/32e063a95e.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bamudepekepa_setumazowido.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/mikukinib.pdfIn PDF document text
    • https://site-1037113.mozfiles.com/files/1037113/xosive.pdfIn PDF document text
    • https://site-1038949.mozfiles.com/files/1038949/bumasupoxuvoriwobatusudim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bc1b9091-7017-4be2-9c0f-e16303fa2106/77488744854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff684e52-e94e-4418-9b1a-762957b896f0/29681414518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c754b926-f9b9-4042-8f2c-2e8ec449586b/16304941267.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f604e43b-e1a0-40f1-9dd4-74c3c1293c46/migititedusuliwika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d312663-173b-4c55-bc36-c27ef77c497b/zariturupopavazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95ed50bf-a5aa-4cc1-a7d8-55efa6607828/26504764269.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74af66b-4045-442a-b342-8fd9605b8333/62036271110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b80f5d48-b35a-4247-af8c-72f1711999e3/72404199115.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000629c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x629C 5364 bytes
SHA-256: 774733c0c019fac1862947d57b1e77a8d624de2aa312fa45def71d08c34dfaf2
font_01_sfnt_off000074ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74FF 6148 bytes
SHA-256: 488ffee5e9c33bcc1f3f00aec749f35977d0cdd209ffadaee35194d66ecc177d
font_02_sfnt_off000084df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84DF 10984 bytes
SHA-256: 716451d26da46c5f19ef58c42eaa54d2cbb190113499c5ffca8a470a1804286d
font_03_sfnt_off0000aa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA4E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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