Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ad0de34721af65…

MALICIOUS

PDF

31.0 KB Created: 2020-11-04 18:12:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: b253e61198467faa33f02bc971d022ed SHA-1: 18cf4fc096f36b25e535f3cfe7c77978b2bee4b6 SHA-256: 81ad0de34721af65c42d289c164de9c19d60a52e0fda03fcd2a996f238eab976
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/wb?keyword=descubre%203%20answer%20key In PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/8730663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5f91d712c338d.pdfIn PDF document text
    • https://jemajodelevo.weebly.com/uploads/1/3/4/3/134394711/sebajodazara.pdfIn PDF document text
    • https://povelelowu.weebly.com/uploads/1/3/4/3/134331265/negubidoxumoseb-xutalofexogekax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383923/normal_5f8d3cf4521b0.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/27dad12a-d107-43b4-bec4-b51595dec8f9/guardian_angel_ambulance_pa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e061413e-b79b-44ea-ba4e-adbe660fcd08/93160348052.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/free_rider_codes_skatepark.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748fe4a8-d653-4b91-a16a-28cd3a11e10b/69074521640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d28f95d-3b1c-438a-8570-28ad6a43e219/tixuvugaxamisem.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C28 5320 bytes
SHA-256: 24a14e5c67d2b6ee58cb6dd6df4258b4a1d9ed89921aeac77c19e3c6b8910079
font_01_sfnt_off00004e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E71 9856 bytes
SHA-256: 4ba8ab2a4d4b79a01319618d00965d47acd98142823d8b5246da3749b9ce543d

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