Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bb225265e43525…

MALICIOUS

PDF

63.2 KB Created: 2020-11-08 12:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: b4696190732ff275e827f0db4c7a0ed5 SHA-1: d84c838a5ea571e12c7d2a17346f3a711d2aea15 SHA-256: f8bb225265e43525ce24f4ba3c50bdacd0d4d9b5c4d3327d081bc32bfde0d7a2
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://trafftec.ru/123?keyword=words+with+special+meaning PDF link annotation
    • https://wuzubetimu.weebly.com/uploads/1/3/4/2/134266391/sojerakukulejigimi.pdfIn PDF document text
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/a03f4e388c5c.pdfIn PDF document text
    • https://miwilokak.weebly.com/uploads/1/3/4/3/134375457/depazol.pdfIn PDF document text
    • https://tarebizadutobi.weebly.com/uploads/1/3/4/3/134310067/925105.pdfIn PDF document text
    • https://zixotojene.weebly.com/uploads/1/3/4/3/134315054/venefesenudadi.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/5649215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f8a7cc2a10b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7a4a846c-5f5e-483f-a258-8f6e36ab54f1/17494076823.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/b_blood_type_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/the_grove_coffee_shop_laguna_beach.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/magisterium_5_espaol_descargar_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/xirevel.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/torrent_download_sites_free.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000941c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x941C 3384 bytes
SHA-256: c557d6e03cf61afb22e6c96cafaa5d4d9ce631797f3cce718258c6aa0fb97615
font_01_sfnt_off0000a03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA03A 5380 bytes
SHA-256: 7ebed356e580ae13a94ec354ac768dad4cf524d1608fa0a619e3a242272a837c
font_02_sfnt_off0000b274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB274 15772 bytes
SHA-256: f0f3cf63904a638aee33d661a20c34410fb68d2af2f633cfd29e766fee220b3b
font_03_sfnt_off0000e176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE176 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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