Malicious PDF — malware analysis report

Static analysis result for SHA-256 39635c9cc47fdd5c…

MALICIOUS

PDF

51.8 KB Created: 2020-10-15 22:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b6fe686505fbb052e21ba4ad4c5be369 SHA-1: f1b47dcd8b241736a867f17b2ae304cca3d13328 SHA-256: 39635c9cc47fdd5c57cbf013eed0815d595b93f4f20336c31e99310a925c6de0
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=similar+triangles+worksheet+math+aids In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368952/normal_5f889b56d718f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f8880b198a4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f874aea3c764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f875e766af4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f8880312324e.pdfIn PDF document text
    • https://site-1040000.mozfiles.com/files/1040000/fidomipagefiluzububusib.pdfIn PDF document text
    • https://site-1040056.mozfiles.com/files/1040056/nixen.pdfIn PDF document text
    • https://site-1036783.mozfiles.com/files/1036783/tanufavavorofisobavadakuv.pdfIn PDF document text
    • https://site-1043662.mozfiles.com/files/1043662/furitivagajajiso.pdfIn PDF document text
    • https://site-1039737.mozfiles.com/files/1039737/nebidixatugavu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_5f888b26304ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f87150e050dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_5f887b9552f61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_5f886f9dde117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f8736f117b23.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/2163eab9-804b-4691-86dc-1af7a0107665/8965771696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8c1073-2ebb-48f3-94c2-f58194d4f1f0/45031934005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eba2eed-49bf-4d61-9026-e68e9385ab11/somujuporunifirumadawul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9b17d3-cb90-4201-984c-d9ef1da0bb26/melolixojewimowulik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc0d3d0-d106-4350-a952-ef79f2c7c77a/27712669501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dac935ec-c498-4820-b6c4-225316d9b5f3/48163317656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718f0d2f-294d-46a0-bd20-8fcf139fbc31/57921643989.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74C9 5500 bytes
SHA-256: 1ccd45f4bfae7d34c177248af373826141444f6b3ee5afe5ecdbe92300f60103
font_01_sfnt_off0000874d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874D 10280 bytes
SHA-256: 1fcf79c440043765993361f58340f8d4c9e85bd95721aded9e73b94b5d5dc59b
font_02_sfnt_off0000aaba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAABA 16448 bytes
SHA-256: f72c050da1b9d2b252b60d923d48b873e3167586161433f4ccd489531a5eaa86

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