Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf76ebbc646e7458…

MALICIOUS

PDF

65.1 KB Created: 2020-11-23 06:17:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: c008bea30b9dd6673b19131d0db96e48 SHA-1: 307412b7d6e77c368035a335ccd61a0058af8b6e SHA-256: cf76ebbc646e74589598e581dd39b3f6ff7ac65546edb514f54f0484e8ee0108
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafficel.ru/aws?utm_term=phonological+processes+exercises+with+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425929/normal_5fa3b84e9509c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f906646743d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366382/normal_5f97b5b8c7d69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403814/normal_5f9633970fe2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425727/normal_5faaca141c41d.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/611661a7-a01a-4ba7-bf07-faf51fc411b4/gutiwogowujenebepewedegas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beabbbe2-7267-4c11-add1-41e8957b1bf1/yo_soy_eric_zimmerman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5171d4a6-8708-437d-b19c-ef187d94da79/34882417475.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/defb12ac-a72a-4549-8f24-34dbb4b01daf/formula_de_karvonen_frecuencia_cardi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/909c216d-2907-40c5-b493-25e5d6c9fd25/30659756863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a2e0b9-12e8-4fb8-8f9f-86c4d2f38731/frankfort_plant_board_cable_tv_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b99a0355-ea59-4bc5-9fe4-6a4f403baaf3/27985077862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3763e2-dab4-402d-ae16-91d82124fcef/safedivogaredajujokuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59eb9895-7001-42ee-a1ae-1edf23a341a3/28570773996.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36F 3076 bytes
SHA-256: 54ea8d415437cda84ac7550c479151837fe88da9f306c046803e40574b6305b1
font_01_sfnt_off0000be63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE63 5580 bytes
SHA-256: f1df751fbfac080b48840db31b7a7c5fec4076d31a935422a8f9ae83200dbc24
font_02_sfnt_off0000d173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 11136 bytes
SHA-256: 5ce566ab5b3af06fe4d6d0580caeb94bae5b93c4972b928b6e49ba709586cd01