Malicious PDF — malware analysis report

Static analysis result for SHA-256 05be10fc58082e67…

MALICIOUS

PDF

72.8 KB Created: 2021-02-23 09:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 822989c9071c135573edb9fb11b4b45b SHA-1: bdbff7c72700d6e6452938d4fe1b1b6f067d2386 SHA-256: 05be10fc58082e67cb714d1c8aeb01738b8e41692330f694fa02f250c0d75ad0
96 Risk Score

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 as malicious by ClamAV and a machine learning classifier. The document body, though heavily obfuscated, suggests a lure related to 'school readiness'. The presence of an external URI and the ML classification strongly indicate a phishing or malware distribution attempt.

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://jacksth.ru/strik?utm_term=why+is+school+readiness+important+pdf PDF link annotation
    • https://cdn.sqhk.co/nububufi/djdhgQS/70253738350.pdfIn PDF document text
    • https://cdn.sqhk.co/rewakevutel/orih5hc/gokovakixubuditi.pdfIn PDF document text
    • https://cdn.sqhk.co/dodipenameki/Rn1ievg/rebag_reviews_for_sellers.pdfIn PDF document text
    • http://boevoenlp.com/iraga_iraga_dj_mix_audio_songavz23.pdfIn PDF document text
    • http://mukumalatixuji.iblogger.org/how_to_get_your_cdl_permit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_60110ccc4487b.pdfIn PDF document text
    • https://cdn.sqhk.co/rivitovolu/92ohhtk/griswold_christmas_decorations_outdoor.pdfIn PDF document text
    • http://nesobaka3.xyz/murdoch_mysteries_episodes_guided384j.pdfIn PDF document text
    • http://cenderaoriginator.com/10634485523o9zm2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvufajozurez.rf.gd/dmarc_report_analyser.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/android_software_update_review.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/dusezexatini.pdfIn PDF document text
    • http://buteboregof.epizy.com/husky_60_gallon_air_compressor_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/formal_letter_address_format.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/centrifugal_pump_types_and_applications.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/50074915211.pdfIn PDF document text
    • http://pewavifasovifuz.epizy.com/how_to_use_blender_to_make_2d_animation.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/83812025253.pdfIn PDF document text
    • http://mujujilunel.epizy.com/15469539802.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_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 5508 bytes
SHA-256: 4ead16a6fea2a8629b385f0a8dc6a60cd1f4d651c82da75281d2abafebe55fde
font_01_sfnt_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 10464 bytes
SHA-256: 9ee738947137ae99c80a60e1823863953346f6ced2b72959188d6a439808c58d

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