Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2241a8be34ea95…

MALICIOUS

PDF

76.3 KB Created: 2021-03-26 09:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 17d480b50818b331c9eec193f1474ba4 SHA-1: e00d858a6cdf91ae32bc03972eb37feea3d92c55 SHA-256: 7d2241a8be34ea953004652a7b41a7a5562c5570c30a8e980a44009e6e076051
136 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. A heuristic identified an image lure linking to an SEO redirector, specifically 'https://pelibifir.ru/strik?utm_term=what+to+read+to+prepare+for+sat', which is characteristic of phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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://pelibifir.ru/strik?utm_term=what+to+read+to+prepare+for+sat PDF link annotation
    • https://cdn.sqhk.co/jolodovi/iUCgcv6/gifegasip.pdfIn PDF document text
    • http://depafelevan.22web.org/91890202432.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/gdAOU3C/air_traffic_control_school_middle_georgia.pdfIn PDF document text
    • http://lekujajivuvire.iblogger.org/lyman_reloading_press_kits.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/geihggF/52527044793.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/sitok/52607253623.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/99236357092.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/jeboburivonepalura.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/are_sat_practice_tests_accurate.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/editable_invitation_templates_ppt.pdfIn PDF document text
    • http://zatejufeg.rf.gd/97947679371.pdfIn PDF document text
    • http://xekabotiwuker.atwebpages.com/bsc_nursing_syllabus_baba_farid_university.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/background_editor_for_pc_free.pdfIn PDF document text
    • http://masemipeba.myartsonline.com/business_analyst_books.pdfIn PDF document text
    • http://moxevigevawoko.epizy.com/61402338382.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/jobezuxazixex.pdfIn PDF document text
    • http://favukimasinete.rf.gd/30962622451.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 5108 bytes
SHA-256: 17e076d22d99c369f6b87f57d2e4b84696fc022149325c80fd144b8d3acc5fdc
font_01_sfnt_off0001007d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007D 10552 bytes
SHA-256: 79b298204c4f1710daca7a3c66e8dd8b2ff352a234521f012efdbedcf31fc664

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