Malicious PDF — malware analysis report

Static analysis result for SHA-256 331bc99a549ab9b3…

MALICIOUS

PDF

71.3 KB Created: 2021-02-14 11:26:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 669eafda31f0baf197c461f7a57f9143 SHA-1: d5aa82e5938ffdb9082430a6fddc2f9da9a7caea SHA-256: 331bc99a549ab9b3f4e279ea3490fc28207c38f27e8db405395328dc54e14280
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 malicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to textbook answers, indicating a phishing attempt. The presence of an external URI and the ML classifier's high confidence further support this assessment.

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://druttle.ru/123?utm_term=world+of+chemistry+textbook+answers+chapter+5 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487618/normal_5fcd1bd67625c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388598/normal_601f33f631e17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487623/normal_5ff340363a3f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501367/normal_601215f7d11fd.pdfIn PDF document text
    • https://cdn.sqhk.co/tokarikadez/2QlH3ig/drone_controller_board_price.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/58gFR99/norvege_eliteserien_hockey.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5fcba023d5dfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418381/normal_6024cf072071d.pdfIn PDF document text
    • https://cdn.sqhk.co/fitodofafe/J3icjhg/34264963866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476302/normal_5fff14708e73c.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/gjkz1ih/philadelphia_flyers_stanley_cup_playoffs.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/v3Bjeii/rc_helicopter_simulator_free_download_pc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xamudakosenezi.rf.gd/99536273330.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/backtrack_5_r3_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/japedagumumemidetupaw.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/gozidige.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/fatopakotawezutisu.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/investigation_report_form_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/dragon_ball_z_games_app.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_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 6000 bytes
SHA-256: f84de44a1799f2d68a3d0452c3a346620753b4d09966ba3b213f0042bc953fc2
font_01_sfnt_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 9956 bytes
SHA-256: 4ce583fc3c8a33af4401108389ae83f4ed2fe874273543dcfcf74e2551140723

Open this report in the interactive analyzer, or submit your own file for analysis.