Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ea1badfab42c81…

MALICIOUS

PDF

71.5 KB Created: 2021-04-08 12:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b092fe291c25bcc73281540579f5ec80 SHA-1: f556b56e5c898a18a7a83e78486adc3eba4bfa4b SHA-256: 77ea1badfab42c81027a3b1973ad66821962b4af43e1df140d7e8aab2186cda9
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, identified by heuristics as PDF_URI and EMBEDDED_URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary IOC is the URL https://bologen.ru/strik?utm_term=bedtime+stories+for+adults+to+fall+asleep+pdf, which is likely used to deliver a secondary payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=bedtime+stories+for+adults+to+fall+asleep+pdf PDF link annotation
    • https://cdn.sqhk.co/moxasapiwer/aUiehc9/ringtones_bts_jhope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_6013f5eebfe48.pdfIn PDF document text
    • http://xodowomasugis.iblogger.org/lenguaje_corporal_y_su_significado.pdfIn PDF document text
    • http://debesur.iblogger.org/arcsoft_print_creations_crack.pdfIn PDF document text
    • http://wilozobugo.iblogger.org/what_is_a_thesis_statement_in_a_narrative_essay.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/iugggdh/starting_an_off_road_shop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_6014f959f20b0.pdfIn PDF document text
    • http://wawimetuboze.iblogger.org/22291482602.pdfIn PDF document text
    • http://wizoditororoxo.iblogger.org/tratamiento_del_alcoholismo.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/bezorito/lefakibaju.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/71169528075.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/97012557996.pdfIn PDF document text
    • http://dadixuxizu.rf.gd/rewowudobogemimaso.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/chromedriver._exe_for_64_bit.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_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 5236 bytes
SHA-256: 4b87690eeb2bc6ed6749d7d932760651b3568203adb85602eb62e889a265407a
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 10480 bytes
SHA-256: 27d5aa3dc4e830a2395404ad0bf5f56d43227b6ecc66007f7abc75145b209d76