Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53fe74b0ab94f15…

MALICIOUS

PDF

73.4 KB Created: 2021-01-04 20:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d2017971deef826ba854b0bbe1219ef8 SHA-1: bf0c82b70a14e50ed47c8cde77987304b764a830 SHA-256: c53fe74b0ab94f155a7b204b08cf230e475528184405a33d99facdb3f3c97f32
104 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a phishing attempt. The document body, though heavily obfuscated, references 'jkbose 11th class date sheet private 2018', suggesting a lure to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffset.ru/aws?utm_term=jkbose+11th+class+date+sheet+private+2018 PDF link annotation
    • https://cdn.sqhk.co/ditetona/ahdjjX9/40771160116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491410/normal_5fc9998c9fcd4.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvojeve/Zmt3srA/idle_empire_mining_safe.pdfIn PDF document text
    • https://cdn.sqhk.co/zivugeri/RO9gFje/car_gear_shift_knob_custom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d8bfde-b7dc-4320-adc6-7733c43c5c5d/zuzebudevesojebasimedudap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68bc9dfc-2026-43ad-b18d-1e0f3fffa47a/macroeconomics_final_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/48846919443.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/86954322346.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/action_buttons_android_icon.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/watch_cartoons_online_free_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/metformin_weight_loss_studies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64f612b2-784e-4e51-aef5-19f90edc771d/67053287416.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/navigation_bar_color_android_java.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/072f624e-bd89-4688-bcd8-a5f5e2d6d9f6/acid_factory_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5beefc5-8c3f-4919-bd13-c3ee24f0f3f6/fovivigiva.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_off0000dd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7C 5932 bytes
SHA-256: 144f591ee6f8f35f15d7dbd5c5a818be694973f69f74aa047d5e96bbb644c452
font_01_sfnt_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 11108 bytes
SHA-256: a1a8613aa8e1551f7279d194d2630e368aa911db7d0e337ddb34c029bb9504e6

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