Malicious PDF — malware analysis report

Static analysis result for SHA-256 c685009ded6fff80…

MALICIOUS

PDF

77.8 KB Created: 2021-02-25 14:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 84590167a99f63d7510c3f7efc13d172 SHA-1: 58add937def8cf765f423481917bd3a6d73cc205 SHA-256: c685009ded6fff804d33e044fd7eb99a1ca03fde74725a4fa820b7a0e0c8b2af
124 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high-confidence ML classifier indicates maliciousness, consistent with a phishing lure. The embedded URL, https://jacksth.ru/strik?utm_term=what+is+the+meaning+of+serenity+prayer, is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to contain search-related text, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jacksth.ru/strik?utm_term=what+is+the+meaning+of+serenity+prayer PDF link annotation
    • https://cdn.sqhk.co/wituruxa/idgjAjg/masha_and_the_bear_castle.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/E83hjdy/25447159483.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/f5jbhfY/the_sims_4_cheats_ps4_realm_of_magic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475853/normal_5fcc256a8c274.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/xuxifuzituwu/english_language_techniques_gcse.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/98370303292.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/concerning_hobbits_sheet_flute.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/adding_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/competency_skill_matrix_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/tibixigopi.pdfIn PDF document text
    • http://lofoxos.epizy.com/que_es_regresin_y_correlacin_lineal_en_estadistica.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/ipad_pathfinder_character_sheet_app.pdfIn PDF document text
    • http://zatojigetafugud.epizy.com/marketing_plan_report_2.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/nuxuvonumi.pdfIn PDF document text
    • http://konevimojo.epizy.com/when_do_whirlpool_refrigerators_go_on_sale.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_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 5396 bytes
SHA-256: df6120a7620b62e7be1e9a44555c27458e966b92c5da27083f2025cf9152133f
font_01_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 10832 bytes
SHA-256: 93fc36c51faf0b3faaf0fde6f1c3ea71d901df94720b761a396bb224284e012f

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