Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c36dcfc80013fce…

MALICIOUS

PDF

74.4 KB Created: 2021-05-20 19:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a90bebbcbd477621e15debf87e9d179f SHA-1: 276fb0f7af0dc5ff789843a087902998369db187 SHA-256: 6c36dcfc80013fce209df13d1f6b2eccef8b19d5883de24bbb811fa853e5a7a4
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a large number of external PDF links, suggesting a link farm designed to manipulate search engine results. One of these links, 'https://jumiwimov.ru/strik?utm_term=who+am+i+this+time+kurt+vonnegut+theme', is flagged as unknown reputation and is likely the primary malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jumiwimov.ru/strik?utm_term=who+am+i+this+time+kurt+vonnegut+theme PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383923/normal_6060fbfa24586.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_5fdc5fd356adf.pdfIn PDF document text
    • https://baduripafab.weebly.com/uploads/1/3/4/6/134623558/f51d96ae65b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406166/normal_6059539519c53.pdfIn PDF document text
    • https://peliwotamo.weebly.com/uploads/1/3/5/3/135325711/sapatifidi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366389/normal_6009565155e35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392193/normal_5feb5c786a64d.pdfIn PDF document text
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/9190440.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_6054ed2d65b08.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/rogugagatuf/important_days_in_indian_history.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/55452134470.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/how_long_will_a_2011_chevy_traverse_last.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/adhesive_vinyl_sheets_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/kutajufogavereretilewufu.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/tasexagatit.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/qualified_business_income_deduction_worksheet_form.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/will_there_be_another_percy_jackson_movie_3.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/46341086175.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/fibavonivinogezupetewun.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/mebalifalowizotaba.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/kepitowuri.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_off0000e8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FA 5204 bytes
SHA-256: 91ef674213fd4dd28805f0a8ddb84832510289982a2137e25d836703ed01cf90
font_01_sfnt_off0000fa98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA98 10156 bytes
SHA-256: d6dd0a209423a6474b66abc24aac55490a06cebcc90235cacd95d18371ff5ae1

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