Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bfd3ab11894b87…

MALICIOUS

PDF

71.1 KB Created: 2021-02-21 13:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6ce3894c07914e38d953ca239ec5cf03 SHA-1: 7cbb14b5828e00b2d4e8b0f1103a8fbb20fc508a SHA-256: e4bfd3ab11894b8790e35609134c4cba994c91fef39af07662a8dc6b6ede4415
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a 'Citizen eco drive perpetual calendar manual'. No scripts were extracted, but the PDF structure and URL patterns are consistent with known phishing campaigns.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=citizen+eco+drive+perpetual+calendar+manual+e870 PDF link annotation
    • http://remastacer.com/huesos_y_articulaciones_del_cuerpo_humanotdh6h.pdfIn PDF document text
    • https://cdn.sqhk.co/pibavasedegi/0pUipgf/hammer_mastery_dauntless.pdfIn PDF document text
    • http://pubgmobiie.com/zapasuvinofibenolizujarebklyc2.pdfIn PDF document text
    • http://idealicaufficiale.website/64934535687pqjy3.pdfIn PDF document text
    • http://seamanygau.best/vcenter_6._7_for_windows7m3j6.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/ijhdgec/lips_clipart_images.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/QEiavha/speedy_hill_car_racing.pdfIn PDF document text
    • http://kernig.store/how_to_redeem_a_code_for_overwatch_on_xbox_onelsjx1.pdfIn PDF document text
    • http://glawerry.online/goxubebezokuxisidogeleboy5wfs.pdfIn PDF document text
    • https://cdn.sqhk.co/mowuseparap/hgib4jb/wabavudumir.pdfIn PDF document text
    • http://santaparker.store/57319491708myywv.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/ajgcicL/ball_bang_arrow_fight_3d_download.pdfIn PDF document text
    • http://checkmycredit.info/35753293779zt4j4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jelenexej.rf.gd/ga_learners_license_study_guide.pdfIn PDF document text
    • http://xasives.rf.gd/tu_nua_shayari_video_3gp.pdfIn PDF document text
    • http://xapopifatudafa.rf.gd/book_full_form_details.pdfIn PDF document text
    • http://bewegemoketofa.rf.gd/67927934470.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_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 5472 bytes
SHA-256: a0fec906162f06d31ef6cd902609788efea97ed70f135d86b053d59453d209ad
font_01_sfnt_off0000ec32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC32 10316 bytes
SHA-256: 6a9538752f902b4cfda001dacdbb80a42e3612c7a2ccd69af42039c4d9531b0b

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