Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2db3e39f46551f7…

MALICIOUS

PDF

64.3 KB Created: 2021-01-19 21:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ddd2a3a21c81c87336afc8fc5dcaea46 SHA-1: b6d35240a674f8d4029ca189e1f547c1b2aff24a SHA-256: b2db3e39f46551f796be5370f63ceade7ee4b34661fd53c5def772b7014ddb47
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'trafffe.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains text fragments suggesting a lure related to a 'quizlet' and the 'Hispanic paradox', aligning with a phishing or social engineering attack pattern.

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://trafffe.ru/123?utm_term=hispanic+paradox+quizlet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459926/normal_5fa358819a8e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389604/normal_5f9b52b494f94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464871/normal_5fca8f945ba5a.pdfIn PDF document text
    • https://cdn.sqhk.co/zeboxuze/iaij40j/ctu_counter_terrorism_unit_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388276/normal_5fa3389c47f5a.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/zomuzigo/xmanager_passive_free.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/arkansas_boating_license_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/board_of_resolution_format.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/26582314546.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/ansible_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/66932806656.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/subakujubojo.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/fugofaraniliv.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/39653057590.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/sedimoperabu.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/posavesakumonetadawo.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_off0000c100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC100 5272 bytes
SHA-256: 4ac43f8d060d59387f32cce2f84144fad79b9896f26629dc3452f4d7ad959627
font_01_sfnt_off0000d2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FC 9796 bytes
SHA-256: e5f96494e084364448492c89f8cf90f32e981ea2368729fdd7454157af7a4eef

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