Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13db5aeba82b6f2…

MALICIOUS

PDF

84.5 KB Created: 2021-02-16 05:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 827efb70fb4d1a3580f460a0e1ef9f67 SHA-1: a47b93983a3fd5a0ecf1dd713e485f82ce55608c SHA-256: c13db5aeba82b6f22c11d800da8d0c4beca90d448b2078717250fc5008c144b4
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by heuristics as an external URI and flagged by a machine learning classifier and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to educational content ('polynomials end behavior snowman worksheet'). The presence of an external URI and the malware detection strongly indicate an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/wix?keyword=polynomials+end+behavior+snowman+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403414/normal_5fe3307a6d2f7.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/jiciigd/dx_player_pro_mod_apk.pdfIn PDF document text
    • http://photoforce.ru/jedemekofabofowunemvlxz.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/fhbheVz/siritu.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/gixawetopoli/bengali_movie_free_site.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/bengali_full_movie_hd_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/zigomo.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/43085727969.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/68269050683.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/5g_antenna_design.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/vugukefomitetedunumape.pdfIn PDF document text
    • http://jobisazukom.rf.gd/bibiliya_yacu_and_install.pdfIn PDF document text
    • http://xarififipevi.epizy.com/pdf_watermark_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/lupotedobalopomika.pdfIn PDF document text
    • http://napilidowolaro.rf.gd/induction_program_for_new_employees_report.pdfIn PDF document text
    • http://wegijadisi.rf.gd/suprema_biostar_2_installation_guide.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_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 5524 bytes
SHA-256: f2c356bf5f5b959d6463d67422c65c9be37c2fb60f72d95d47212b2f73b89300
font_01_sfnt_off00011d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D00 11564 bytes
SHA-256: 55b27bc8b472b4f8178cc7ff6c9e8035c0c175be3b248b6c7388735b643de713

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