Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ad4dcc6938c383…

MALICIOUS

PDF

72.5 KB Created: 2021-04-30 20:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1619d52c3e01e0be830af7561eaf790d SHA-1: b1fc30bae71896b3b687a7334e4576a12c460ba2 SHA-256: 66ad4dcc6938c383c24bccdd1d71114834f168ac8986ba241b64a6663b0bcf24
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a clickable URI pointing to a raw IP address, which is a common technique for phishing and malware distribution. The presence of multiple similar URLs suggests a campaign distributing malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607c631cd3a7a---tuzedovuve.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080005611fe2---47094878840.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b96ee0e06---365568352.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/5hcvglsho652se2jeq44cn9cja/61925251081.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bb10e4bb0af56049b0ffb62879a922e6/84808822935.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cf4bcfe98---28029524337.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa401674d1---80826156551.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bfc9d0a0d---sinamijabuxir.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/e15afc5fb7e31758920cff126caf4f13/dizafinuvebozodufanevesid.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/cad994197049b5c6149c29282edd0ff4/51813558341.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/acb134eeac64e4c84ccc67461d6f4ee1/lalivibuwor.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/b312fa8b76ab409dedc998a34c20aa57/tunokoxoxogamovimaneto.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2a0385e9ed8ff271646a23698b063703/2525674765.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077cd2b55c47---dobafasivufutazofubim.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/76580824407.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/44bb6eeea46fd88785d30925f0cd7e2b/62288841823.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/27341ac8d0135c1067640ce34ad9d7db/solosexipolesod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=developer+mode+google+chrome+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deae.bin
215c355fc132f7218e486991b43e55c1b7ea7c9b39a91b1928a0acc69a008b4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 5368 bytes
font_01_sfnt_off0000f0cf.bin
f49cd5b0459d3fab902285c7d46e06c50c253193635f0ff9265458ae8efe0d27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 10604 bytes

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