Malicious PDF — malware analysis report

Static analysis result for SHA-256 721d6ce7e9381373…

MALICIOUS

PDF

38.4 KB Created: 2020-11-08 18:48:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 360759efdecd14a3b26d251c64f5c905 SHA-1: 912a78d3149cba4cc3fb8b23cd29abcb285fcf2a SHA-256: 721d6ce7e938137391fe852e14463bfc17351bda1c47c549657a66af400d70dd
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://traffine.ru/aws?keyword=triangle+midsegment+theorem+worksheet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_5fa0294eb3998.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/3672819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f9100c5e7edb.pdfIn PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/b2ce4479f.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/521236.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f93d1fac80a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_5f95ad5d1fec7.pdfIn PDF document text
    • https://woxomeze.weebly.com/uploads/1/3/4/4/134498023/gijodenemabemi-sugufunef.pdfIn PDF document text
    • https://jotevalosovem.weebly.com/uploads/1/3/4/3/134385082/222de1147f3c.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/wilugugo/cahier_journal_enseignant_primaire.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/40883004920.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_off00004403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4403 5560 bytes
SHA-256: 49e828f7fe3f32c4bdf5abd1de32d4b6d7e82ac35322b11fa38402992797902a
font_01_sfnt_off000056d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56D4 9668 bytes
SHA-256: b6fce0324cd64c452e791913ecbe687c452704c50610da4581f5fe608638687e
font_02_sfnt_off000077da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77DA 16076 bytes
SHA-256: 50df7297aa6e1701a442a0724f39a6a1ba3f155ffe3089d56176e33689c43cce