Malicious PDF — malware analysis report

Static analysis result for SHA-256 c076b2bc861d7d0c…

MALICIOUS

PDF

65.3 KB Created: 2020-12-13 21:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a490f76838d5bb3c6164b473c98eef25 SHA-1: 56ad578eea8502bfa52450465f5b5aec3b662665 SHA-256: c076b2bc861d7d0c84e0a9d0f410c720b1ec8579b795d808e4fcb8f8ef03239a
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to a 'listening comprehension test pdf with answers' and embeds a URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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/aws?utm_term=listening+comprehension+test+pdf+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451544/normal_5fa0d446e6c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464734/normal_5fb8414dcdf8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_5faa42bfbb5c8.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/pewebopufupe/cam_camera_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/589a77b1-7ec1-4a88-9c13-4e60ea2e04c6/south_chagrin_reservation_hiking_trails.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/words_that_start_with_hang.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/new_michigan_ecpe_c2_new_final_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/on_december_1_campbell_co._borrowed.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/96755113682.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/39183717596.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/72665004680.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/cumulative_form_meaning_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/60814596970.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/duzelidavasuluzid.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_off0000c015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC015 5568 bytes
SHA-256: a0a70110c3ba6b00b5d6bf6fb16de2495ffd1ecff9c7e966cae8ebcacedea081
font_01_sfnt_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 10960 bytes
SHA-256: af6c125cba3e2b3afa1738aa58a3e64296eecc60827dbae5ed74618df869ef55

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