Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f5f1159920235af…

MALICIOUS

PDF

63.2 KB Created: 2020-12-20 17:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8a50e0a06a53abdadeb898481cacf7f0 SHA-1: 7474d2ca3359535560d52c9b5714ebc6f5b7a621 SHA-256: 9f5f1159920235af40f5a1a67029c1e4aa4969bf43aeae1ce8155ac419cb678f
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'calculus answers', aligning with a phishing pretext.

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://trafficel.ru/strik?utm_term=cpm+calculus+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f8ca3c11b7d3.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/bidivo/arceuus_favor_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/20565893731.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/87260600885.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/banner_life_insurance_beneficiary_change_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb31e392-291e-4f5d-b238-d2b822b68d3a/majivagonolikojepak.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/alchemy_game_app.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/punctuation_and_capitalization_worksheets_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/instagram_videos_on_iphone_6.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/schooled_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0434c82-0c23-434b-a21c-fe5a2faea750/english_grammar_test_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/drunkard_sekiro_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17c4b12-0c6f-4306-94a3-de5888a4a171/36182499125.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_off0000bc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6E 5296 bytes
SHA-256: a3c68f48feca27861be73f27a70bbd677214651e3d1b8cbfb4cdf8d90f1fdabb
font_01_sfnt_off0000ce68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE68 10148 bytes
SHA-256: ae477a8438a29076588c4eedcf2a79d8cbf2801cf997f7941a2fb3ba6c88b525

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