Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5faff8e3df3dbd…

MALICIOUS

PDF

79.0 KB Created: 2021-03-15 16:24:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d9e341ef4550d34a4c4ee034c88a532c SHA-1: 6f579e66f8130a4beb8f2d56b843e74a40d00b4e SHA-256: fb5faff8e3df3dbdc4aa8e6f43864f36d2c0d7401d646665100b95189ddc21cd
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL that leads to a suspicious domain, likely intended for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to educational content, suggesting a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/wix?keyword=chemistry+worksheet+mole+conversions+and+percent+composition+answers PDF link annotation
    • https://fadegedisumobe.weebly.com/uploads/1/3/5/9/135992854/dobupoxidu-numimi.pdfIn PDF document text
    • https://fudegenajeno.weebly.com/uploads/1/3/4/5/134581691/5837584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_60307773c8e71.pdfIn PDF document text
    • https://mofalapew.weebly.com/uploads/1/3/4/3/134307760/ginezagodifa_rebuginiwuwilol_bunadulilov_mopewez.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/ojaCijJ/olvidar_conjugation_past_tense.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/cs6Togi/adobe_photoshop_fix_app_free_download.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/rejad.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/eA4hegi/dogikibomasokukurewer.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/koxhehb/facebook_lite_app_not_loading.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_603efd3e41394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_5fd3a8b696fe5.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/xapijifas/conservation_of_biotic_resources.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/is_garmin_s20_better_than_s10.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/medical_equipment_specification.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/modudiraxusudexuz.pdfIn PDF document text
    • http://fapobek.epizy.com/cours_anglais_bac_algerie.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/arifureta_light_novel_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/60003134145.pdfIn PDF document text
    • http://mapexas.epizy.com/42155775387.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/74887708890.pdfIn PDF document text
    • http://bowukedogatowo.epizy.com/pubagigobepoweviwofig.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_off0000f47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 5536 bytes
SHA-256: eb637d8c5cde0a53db82bd97c475349136b1404d65ee3199baa44b32c03a8396
font_01_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 11424 bytes
SHA-256: 6ec2958b8f72b66f14eaa412f54a3f4a363f058aea2a8f8ac129cfe348bea081

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