Malicious PDF — malware analysis report

Static analysis result for SHA-256 123d4bb0e7d3a432…

MALICIOUS

PDF

54.7 KB Created: 2020-10-06 19:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: d0f334f58f04c19f8ad3e46f9bdff88e SHA-1: 249910b83147a4f31871a2802cefa39352e1b975 SHA-256: 123d4bb0e7d3a4320084d3a58560391e73ebacffe66c94100d941771d06fff91
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://ggtraff.ru/strik?keyword=9th+class+math+notes+in+urdu+pdf In PDF document text
    • http://files.brtrescue.org/uploads/1/3/2/7/132740743/vexusoreduvokaso.pdfIn PDF document text
    • http://files.hillhousecollegeadvising.com/uploads/1/3/1/8/131856844/1793798.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/b6caa986-f7d5-4b52-8b12-737a5db9d507/25999858551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2eb8245-b1e4-4e58-a1ae-22c661f93e28/kokifajipodawejagubasiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edaf14a0-5f55-4a42-9f34-433be7f84a77/23343903395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73213ab5-c2dc-4a02-8043-dd830f87e8bc/woxakelebiwatorisoxibazaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/620c33a4-565b-4062-ae44-25d5a8e42e2f/famumefuzevuzevibosofero.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0537/0787/files/orange_front_door_colors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3783/6710/files/33721079987.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3748/9309/files/kojunujip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/905a4c21-839d-41bd-a2f4-49be47c2e343/dijidosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b79cc72-098e-44c2-afb4-d823a85b8bb6/vozarija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3cc32bb-46e0-4c16-92a1-1572c0b159dc/22533383720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d3e30d-95ab-4f73-b7cf-f80a099f8f6c/ravadotokulebufaguvoziwem.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000a392.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA392 24428 bytes
SHA-256: e52830aafcd1b95d40dfc47ba0614842699dca26b785bb2faa5089adc67d0a34
font_00_sfnt_off00006e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E53 5456 bytes
SHA-256: 4aa5cad9ebd24befa3c3390bc5a6d9a0cfc6b7d15adc409c46387b29a7322c51
font_01_sfnt_off000080b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80B1 10136 bytes
SHA-256: 744b6c4d9f7b345f321ba6fd02e3de58e9ef565091bcce30ca940a98d56d5513

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