Malicious PDF — malware analysis report

Static analysis result for SHA-256 10929c5c2a6f5784…

MALICIOUS

PDF

72.8 KB Created: 2021-03-09 18:50:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b4ff6ea664c365c21028f2bdfe90dd90 SHA-1: 0a9fb96f19d9f15709d5cbc8f3bec8201d24584c SHA-256: 10929c5c2a6f578429b4a34f437610cda3e895c141c9bd792c8b9cd90c2616df
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an external URI pointing to a suspicious domain, likely intended to deliver a malicious payload or redirect the user. The document body, though heavily obfuscated, appears to be a lure related to academic materials.

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://gimoguvi.ru/wix?keyword=ap+calculus+ab+examination+tenth+edition+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374984/normal_6022bb7481e4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_60379bc7f1495.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380675/normal_6001010e02f96.pdfIn PDF document text
    • https://cdn.sqhk.co/sajixobuko/YvK0eo2/falling_in_reverse_drugs.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/gesjeL4/knife_battle_gameplay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497685/normal_5fdab13022df8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490264/normal_5ffef08714199.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/Fhphbid/cool_tie_dye_designs_for_shirts.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/wopari/30526532261.pdfIn PDF document text
    • http://ziriboxemo.epizy.com/breville_juice_fountain_plus_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/tolstoy_hadji_murad_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/what_causes_high_pressure_in_air_conditioning.pdfIn PDF document text
    • http://vafowoloxesimam.rf.gd/savofibudemagekofoja.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/jobipodurajubog.pdfIn PDF document text
    • http://kiwusegofavuto.rf.gd/weathering_and_erosion_worksheets_high_school.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/how_to_cite_sources_in_a_research_paper_from_internet.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/77873357097.pdfIn PDF document text
    • http://doledakejopoted.rf.gd/62168093577.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/desovopimufilusutuvawali.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_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 5684 bytes
SHA-256: 64cf259b86e95bd7fb96a9c530066aad67680df91c72dab2ea2b2be5a45e893b
font_01_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 10928 bytes
SHA-256: c6ad184765c13be7336ff1ff23e956cab10b9bb6aa74276ca5828f1dc65cc338

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