Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bde6225de50d790…

MALICIOUS

PDF

76.0 KB Created: 2021-03-28 23:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c2942b330b15150e908fc9fd4353e125 SHA-1: 201aea4b89e25ba5bbd0f015a285460c3508ca79 SHA-256: 9bde6225de50d7909ff378d51eca417e58b747b54399d0bdb32d97d4860117a1
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an embedded URI and an SEO redirector link pointing to 'https://soxebez.ru/123?utm_term=comptia+a+study+guide+pdf', which is designed to trick users into believing they are downloading a free study guide. The document body is heavily obfuscated, but the heuristics strongly indicate a phishing attempt.

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://soxebez.ru/123?utm_term=comptia+a+study+guide+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403952/normal_6003fce6db9b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462352/normal_5fcb307f22ffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489429/normal_605d20be49955.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416140/normal_6005c052ad89a.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/gajubo.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/broken_halos_sheet_music.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/sound_blaster_zxr_software.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_5fd38b15edf78.pdfIn PDF document text
    • http://xixofafil.medianewsonline.com/cules_son_los_7_pecados_capitales_de_la_memoria.pdfIn PDF document text
    • http://fumuroruzej.medianewsonline.com/14173654051.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375203/normal_5ff40b77f112d.pdfIn PDF document text
    • http://xomerisupudegop.medianewsonline.com/oxford_literary_dictionary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0aee4dd-c5bf-4c29-adcf-3aa844f59ef3.filesusr.com/ugd/193d13_bfe25a7df5bf4c79ac802c622d6b0c2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/senodiw/coca_cola_scholarship_information.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/is_the_movie_the_book_thief_a_true_story.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/hedda_gabler_play_guide.pdfIn PDF document text
    • https://6c403777-3bdb-430d-a4ca-23d5788374d5.filesusr.com/ugd/e0034b_9f62c34427cf46ef9bf6abad06da9712.pdf?index=trueIn 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_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 5240 bytes
SHA-256: d403f60075ef0e9858d610e47e11bbd619e01aa85b3728317781bda320eb1d93
font_01_sfnt_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 11252 bytes
SHA-256: 10b23f93062fa1b51ecae420b9fab31c6695b91846d4977ff3a47da5f6816ac5

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