Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91099102acc0ed3…

MALICIOUS

PDF

73.9 KB Created: 2021-03-02 22:55:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 718ca4d9f0c40ce56cf8560e02dc6c34 SHA-1: d7a2e353b1c90012e2945d4b3c781741fa248816 SHA-256: d91099102acc0ed3fa3e7bc78a2334f4cbadd23a040684fbd431f7fb470b0bbc
136 Risk Score

Malware Insights

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

The PDF file contains a lure suggesting it is an answer key for 'The great gatsby final test'. It embeds a URL that acts as an SEO redirector, leading to a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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://xajibur.ru/wix?keyword=the+great+gatsby+final+test+answer+key+pdf PDF link annotation
    • http://narelavupes.22web.org/whitewash_platform_bed_frame.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/dicSgi1/duzufavuweki.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/SYs7Xic/skulduggery_pleasant_movie_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/hihFhaj/21808936008.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/ibiaTjg/norigos.pdfIn PDF document text
    • http://mapovepajosoxub.iblogger.org/guvekekonijeto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gavobawum/would_you_rather_questions_for_kindergarten.pdfIn PDF document text
    • http://lapapagidufabo.rf.gd/iso_27001_espaol_descargar_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/21288439846.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/gurugram_university_date_sheet_bsc_1st_year.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/hooghly_zilla_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/onkyo_tx-nr636_arc_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/alcoholismo_en_los_adolescentes.pdfIn PDF document text
    • http://zuwosopawekaz.rf.gd/used_sheet_metal_folder_for_sale_uk.pdfIn PDF document text
    • http://lidesesepaz.rf.gd/arkanoid_game_for_windows_7.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_off0000d745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD745 5328 bytes
SHA-256: 35267a31b4c77bc867131c8af35e2ed005a9806360d24b1def00a52c75bcddad
font_01_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 10184 bytes
SHA-256: eb4a73465a0ed1589e5f031c3e759e9ddf3436fe694083502c09e58e57b52627
font_02_sfnt_off00010bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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