Malicious PDF — malware analysis report

Static analysis result for SHA-256 7535f4816adabc30…

MALICIOUS

PDF

76.0 KB Created: 2021-03-24 15:19:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 98afdbc55a70b6b0b736167714c3a36f SHA-1: 513fbdec847642c07951a336f0d1cdbd905c69dd SHA-256: 7535f4816adabc303c62fdbba13b2387540d8e9a3f3901fbb4546d5c416eb59c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-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://vilenefex.ru/award?keyword=burp+suite+tutorial+sql+injection+pdf PDF link annotation
    • http://lisolu.org/78013861624ljmwh.pdfIn PDF document text
    • http://antonioit.space/mcgraw_hill_connect_biology_answers_chapter_4i89st.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/hfjffgf/final_fantasy_xiv_download.pdfIn PDF document text
    • http://jolamuvinuma.iblogger.org/69809527626.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/jbibgia/rankerx_vs_seo_autopilot.pdfIn PDF document text
    • http://notapeb.iblogger.org/64738519798.pdfIn PDF document text
    • https://cdn.sqhk.co/gedugari/WVqhdYs/minecraft_pe_1._2._10._2_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zegudonokor.epizy.com/marketing_research_template_word.pdfIn PDF document text
    • http://tulakitukubipi.epizy.com/polyphasic_sleep_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/icao_annex_13_2016.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/how_to_do_speech_evaluation.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/xusuxekinamukafijudakata.pdfIn PDF document text
    • https://cd8fad78-6a19-43c6-878c-830d169ee42d.filesusr.com/ugd/ff0d91_7b79536537b4472cbbe0d45b36820424.pdf?index=trueIn PDF document text
    • http://gipebevu.atwebpages.com/4th_grade_fraction_word_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/30562720181.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/chocobo_color_guide_ffxiv.pdfIn PDF document text
    • http://jelezok.epizy.com/algebra_1_workbook.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_ccb473c74dfa4ebd9059128ed2ce4f8d.pdf?index=trueIn 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_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 5400 bytes
SHA-256: f97f1cb8f10f79028dc8e47b20b82085f896f4882892c7c8618ae8a23bd87c63
font_01_sfnt_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 12024 bytes
SHA-256: 9fbfa42e5b3c5dfa06d2710b76597fa7757ecdadf884f540965066af72011511

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