Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb39439e4e09dae3…

MALICIOUS

PDF

76.2 KB Created: 2021-02-12 03:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9b174617c258dedee27eac074e123bab SHA-1: 45f111a28aabceed12c948773488731c3aeea49d SHA-256: eb39439e4e09dae315f1be485abcd1bbc102fd09c07be72c3d34cf2489b59ff0
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/wix?keyword=terraria+pre+hardmode+checklist+1.4 PDF link annotation
    • https://retorize.weebly.com/uploads/1/3/0/9/130969817/1604497.pdfIn PDF document text
    • http://f1l3download.site/delaware_llc_annual_report_filing_feeckm9l.pdfIn PDF document text
    • http://adv-workshop.site/8682846166452npc.pdfIn PDF document text
    • http://opt05.ru/unit4_excelerator_manualzz338.pdfIn PDF document text
    • http://maximizator.online/free_4k_wallpaper_for_iphone_11jgonw.pdfIn PDF document text
    • https://vusutiti.weebly.com/uploads/1/3/4/7/134762674/dfbf7c39.pdfIn PDF document text
    • https://cdn.sqhk.co/bunigenozav/gdSJSTM/pinebizinepiradelu.pdfIn PDF document text
    • http://notdull-eng.online/la_nueva_derecha_alain_de_benoistidtcw.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/sigobija/bergretter_episodenguide_staffel_10.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/create_access_database_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/braun_thermoscan_3_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/education_board_result_marksheet_2018_psc.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/koxipefono.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/pofasulirupod.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/html_button_prevent_submit_form.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/clasificacion_de_anemias_en_pediatria.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/kobututudokekidatapikel.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_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 5496 bytes
SHA-256: d6d541988ca3547682b269d3a9676b4260a526a5765b398b6328c112067488b5
font_01_sfnt_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 11384 bytes
SHA-256: 8efac9c9b45aa9ef471f14718778999bae64a2cc2d65bf1640829b39e6ee06b7

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