Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1aa8419363d4366…

MALICIOUS

PDF

70.7 KB Created: 2021-02-27 21:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: acee28bfc6e4fbaf9d066b11995a539b SHA-1: aa7585bd28d896b325bfaccd443e83f721a7239c SHA-256: c1aa8419363d43662922c2bdced4d61912329b0a2bd540a04708fe84d5e612b4
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The document body, though heavily obfuscated, contains text related to 'kobalt saw' and the authoring application, suggesting a lure to a phishing or malware distribution site. No scripts were extracted, but the presence of an external URI is a strong indicator of malicious intent.

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://pelibifir.ru/strik?utm_term=how+to+use+kobalt+saw PDF link annotation
    • https://cdn.sqhk.co/buzovegom/OvhafuW/64786765874.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/jgVjafp/zijidid.pdfIn PDF document text
    • http://xokubenafap.66ghz.com/kozobiropebigebiwabu.pdfIn PDF document text
    • http://duboxol.iblogger.org/high_school_report_comments_examples.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/nigimul/75432166202.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/pebewe.pdfIn PDF document text
    • http://kedokonox.rf.gd/90914708701.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/34425893798.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/big_hero_6_2014.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/mabofutuferobujemelutaw.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/dyson_big_ball_animal_2_spare_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/97449716999.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/66060994712.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/jasirukufenipoluzugoneto.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_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 4840 bytes
SHA-256: 3152fba384f9afca5397b58cbfff592c620b94159b263a197bfe6308e60bd08c
font_01_sfnt_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 10236 bytes
SHA-256: 9e44ae2393a1f2d849977ae4aeb77be0238b028d8adbfa71ade9145576cea43a

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