Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8254ea6f27784d…

MALICIOUS

PDF

65.7 KB Created: 2021-01-06 19:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c43f3d576ae4f1d0b3abd875240c1001 SHA-1: 701e04eac94e5d05327d40aea66d11af868f0aec SHA-256: 8c8254ea6f27784d464a22b79fbc0ea7d58c55a534414ff20c776cff0c879441
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains references to 'present tense worksheets grade 4', suggesting a lure to trick users into downloading and opening the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/aws?utm_term=present+tense+worksheets+grade+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408719/normal_5faa2b7cce2c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454306/normal_5fdac10e5fa00.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/WbjjDhg/10367865980.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/boxujetanonikuv/59510174756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd84d5ad-c3b6-4731-9888-187c3396ca2b/xobagenukerozez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ddd8dc-804e-4458-8f0b-265f08d22519/burrito_bison_unblocked_1.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/farmacologia_del_pancreas_endocrino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/594b62e2-b842-4c42-8e27-15601ac62e7b/campbell_biology_11_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf237ffa-b6e2-4365-965e-97e30355ea98/the_skin_of_the_film.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3195f832-bdf4-451b-b80b-3dbebcabd56a/adventureworks_database_query_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/al_quran_in_word_2016_free.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_off0000c296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC296 5300 bytes
SHA-256: b3ce83d7ddb4746212b8cdfa3d4329020423ff91ad13a4f98ed108ce25eee340
font_01_sfnt_off0000d4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B0 11028 bytes
SHA-256: 0332dd97177c57cefbe2753c3cae81d9413945ec10e65e7adc176dbd3d0e323b