Malicious PDF — malware analysis report

Static analysis result for SHA-256 767a61f77e418ba6…

MALICIOUS

PDF

66.8 KB Created: 2021-01-29 10:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: b8826ff01e3d0672dce502c080eea518 SHA-1: 7096655d5d6ec75326e67186e043da46edcd09d6 SHA-256: 767a61f77e418ba67fd72d07fb67469894564aa91e982acaa84ab95fd905d744
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/aws?utm_term=money+denomination+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388158/normal_5fdae8f6966cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381737/normal_5fff5b773b9b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413007/normal_600a46dc2f38a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375196/normal_5fc61a63ccef2.pdfIn PDF document text
    • http://businessoutsourcing.org/natedazaxopunetujdbil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496586/normal_5ff1e3463ea74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478378/normal_5ffb127b4a402.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/vukusa/wopilewujukoda.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/dinamunivob.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/deserts_of_the_world_word_search_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/22878033655.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/gymnopedie_no_1_sheet_music_virtual_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/fender_custom_shop_spec_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/abrsm_grade_1_piano_book_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/deped_grading_sheet_grade_11.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_off0000cb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB25 5296 bytes
SHA-256: 93c4a966ee0ae6d14dd317d69a9f97ac93a3bc8c7bf2c7d155e5f575e44e1c46
font_01_sfnt_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 9860 bytes
SHA-256: d95effdb06e8a37071ef03f0ffc66f0a2482b1ae1e247e1579054ab22e61c087