Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c033d91ab572690…

MALICIOUS

PDF

90.2 KB Created: 2021-05-21 09:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 657a6f157f28778c4f2d7c5c58d59934 SHA-1: 4abbd549fe929dd16d9ce0423820595fab479569 SHA-256: 4c033d91ab5726901bb25eecf50afcc6df2b3c232a2dff9213da0dc9c9eb12fe
96 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely for credential harvesting or malware distribution. No scripts were extracted, but the PDF structure and external URL indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=what+is+ccna+passing+score PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476275/normal_6003dc7228fde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453741/normal_603f0f26cc0c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375908/normal_5ff7a9ef5585c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_604d0f670bcbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499002/normal_604d089399f44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411491/normal_5fefc965a8fe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417208/normal_606e593cdb1eb.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/tinivukedeta/mogigikunativome.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/90550151313.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/bonorogafegoxozex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09dc279-9e09-43af-9634-d56b56383a69/99933260673.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/986744b7-9f4d-444a-8cf3-8c2761236361/beethoven_moonlight_sonata_sheet_music_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9455325-de81-4424-8b4d-269db13f5065/how_to_calculate_average_of_marks_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/bareilly_ki_barfi_full_movie_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/adidas_linear_performance_duffel_bag_small.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4c506cf-3af6-4e50-ab08-e795675f07f2/7051532725.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/pipegokulenazagozub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2286bc-6e32-4834-b759-369df5c5382a/bryant_plus_90_filter_change.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/five_ten_guide_tennie_mid_ca_sun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/861d10d5-0546-41b9-9f9f-d23866ec5419/what_color_is_green_blue_eyes.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/gidezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11dd19c7-7088-4917-835e-291ffe7052db/gatezadopunaj.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_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 5176 bytes
SHA-256: 9856828eca27313cdf8b61b09d37e927d125a840cd262ed4337bd81a07458747
font_01_sfnt_off000134b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B7 11364 bytes
SHA-256: 3278bacf21a2b5d2df9284ce229760d813dbdbc41633af927e22cfcaa920dbca

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