Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9263f27fa5c5df4…

MALICIOUS

PDF

52.9 KB Created: 2020-11-08 09:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: f21a15c1a6799d7bcf2badee8ef8bb36 SHA-1: 13e29355019d521daded33936917efd95ad1b6c9 SHA-256: f9263f27fa5c5df4b4b60de2643977d03ee9a78b84f8c583ee9de555e08a6204
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://trafffi.ru/123?keyword=teresa+giudice+daughters+2020 PDF link annotation
    • https://turekapagatonug.weebly.com/uploads/1/3/4/3/134327337/b74a250f5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459477/normal_5fa2457480469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5f9147d45ff4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392658/normal_5f9c41b42c8b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381759/normal_5f9f0f12c2cfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5fa35815ec132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5f9484a6f0ca7.pdfIn PDF document text
    • https://fejamelaluboj.weebly.com/uploads/1/3/4/3/134311679/0ba7ce91f1c56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_5f876c1f35c19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/guxosa/lurapomuwepemadotegoberu.pdfIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c23478e9-c470-494b-8227-5dc8d336047f/53280020401.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/cyberflix_apk_downloader_link.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/xodedatudumotijalodopa.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/kusokozenuwulepesubavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ec4c69-d140-4e16-995f-18995c3ba71e/prface_anthologie_amour.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/65977916517.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6844 5392 bytes
SHA-256: 4c95310633b75e5ba092c6876628efa38b6b5ed73db1880bd8a4ffb703fb20bb
font_01_sfnt_off00007a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A89 2056 bytes
SHA-256: eac9e43885658c120d2e416963c959563f7e433b8f32ef18706e35dd8843976a
font_02_sfnt_off00008452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8452 10664 bytes
SHA-256: 1535f20abe8c43f993ebd3981b0f185e2138b1d9aab1346154169b7638c699a9
font_03_sfnt_off0000a8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A8 16168 bytes
SHA-256: e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443
font_04_sfnt_off0000bd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9C 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19

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