Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f509aae6d6986b…

MALICIOUS

PDF

72.9 KB Created: 2021-03-17 17:15:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 62e2ce1184051602ccf8d6dd47722563 SHA-1: 245265a0099c93a9ad9726329aa9a9035c597a55 SHA-256: 35f509aae6d6986bdfa15758ba813ef881aeb4bf676de7f7a00818b5d93ce842
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document body, though heavily obfuscated, contains text related to 'Caderno de caligrafia baixar pdf', suggesting a lure for users seeking such content. The presence of numerous external URIs, many hosted on disposable domains, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://nipisod.ru/123?utm_term=caderno+de+caligrafia+baixar+pdf PDF link annotation
    • http://vavazexowupex.medianewsonline.com/what_is_the_phase_variation_range_for_reflection_coefficient_in_the_transmission_lines.pdfIn PDF document text
    • http://pet-guru.shop/97464978057thcuh.pdfIn PDF document text
    • http://gamokidawenikon.iblogger.org/46603640096.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/how_to_clean_bissell_proheat_2x_revolution_brushes.pdfIn PDF document text
    • http://gomijojupi.iblogger.org/xetatixisobovewosazanosa.pdfIn PDF document text
    • https://venonaneguwar.weebly.com/uploads/1/3/5/3/135398509/213106.pdfIn PDF document text
    • http://net-klientov.ru/program_management_office_mission_statement4fwyr.pdfIn PDF document text
    • https://kofepuxola.weebly.com/uploads/1/3/4/7/134718869/372939be1.pdfIn PDF document text
    • http://gixuzozubo.22web.org/63058750127.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://janaradoru.rf.gd/data_analysis_plus_excel_2016.pdfIn PDF document text
    • http://xodolipifonabo.epizy.com/86026578500.pdfIn PDF document text
    • http://senesijosezetu.myartsonline.com/service_level_agreement_between_two_companies.pdfIn PDF document text
    • http://modenizax.epizy.com/8th_grade_math_probability_worksheets.pdfIn PDF document text
    • http://wodowepakimeko.onlinewebshop.net/rajikuwusefosilubo.pdfIn PDF document text
    • http://xumuritikoxuk.myartsonline.com/what_does_nett_profit_mean.pdfIn PDF document text
    • http://tugemiwire.rf.gd/90867809539.pdfIn PDF document text
    • http://bajipodi.epizy.com/34818290382.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/banipikikekanajokopegemev.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/nuevo_uniforme_pureza_de_maria_bilbao.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/78345525816.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_off0000dd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 5256 bytes
SHA-256: ff58ea8ff699481861816d0ac2a7f5e75f8bb48e7772c71b1df1d1a581d462a9
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 12964 bytes
SHA-256: a604d248bac9f1ee6836bd27586dd181887a0c0fa75e9b124c99dae344b560f4

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