Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ef9477e5390f1c…

MALICIOUS

PDF

51.8 KB Created: 2020-09-30 11:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e7e4923ba3fd4d5ab8576be4ba712072 SHA-1: cb34035f8c2ea2c765ee804011a1f8b277b6fec3 SHA-256: 07ef9477e5390f1c2ca3988a17f47365e50a86f03ca10c2d6b3f6bdb9adcc19f
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=application+of+buffer+in+pharmacy+pdf In PDF document text
    • http://wufopu.syrianmigrationsolutionsproject.org/uploads/1/3/1/4/131455463/2816914.pdfIn PDF document text
    • http://files.compassionvet.com/uploads/1/3/0/8/130874474/detomase-dutizoxoxunesam-nomifesukovu.pdfIn PDF document text
    • http://files.capecodsharkdiver.com/uploads/1/3/1/4/131483383/wozunidumudefuv.pdfIn PDF document text
    • http://dupefunor.thegintinbar.co.uk/uploads/1/3/1/4/131436972/kolopemuwelu.pdfIn PDF document text
    • http://files.jeannekipke.com/uploads/1/3/1/6/131636889/2766312.pdfIn PDF document text
    • http://vovudut.edushorts.com/uploads/1/3/0/7/130776255/gikedodaxomejinuzuvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/rirofader.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3140/3423/files/fitujalujir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/bozalebupuvenixabefodu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4912/2983/files/algebra_1_common_core_regents_course_workbook_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/hamid_khan_class_9_questions_and_answers.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_off00007123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7123 5448 bytes
SHA-256: d134cb1e7ea21149fff348ca158f5b3420f55a718ae2c57f45b7176a0d784605
font_01_sfnt_off00008389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8389 12836 bytes
SHA-256: 8250a5f3bbd559818ae3a9e1b9a69c927fd1c7df1133b20d3bde3961a662a685
font_02_sfnt_off0000ad71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD71 16104 bytes
SHA-256: cac6d75bb56eb3c1714d15d17c29e4047cf42f446f78795c6ef90e2e923dcb61