Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a6e010f645c734…

MALICIOUS

PDF

150.0 KB Created: 2021-07-04 06:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9099c86c0f20626554e0f15579280921 SHA-1: aa89ed4b52f8ff7a03286da8b0e9b38bd0e02d86 SHA-256: c3a6e010f645c734922456ab4266aa73af48cb276e818e2ffc19ddfbeac9459b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple embedded URLs pointing to external PDF files, suggesting a phishing or malware distribution campaign. The PDF structure itself is malformed, with duplicate object bodies, which is a common tactic in obfuscated malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e02b2a1ad21---fapopagidutuguno.pdf
    • http://planetamama.ru/files/file/koludidomesituvejotagi.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/cb173c8d0152f3a3ba3882fb92aacc95/55314553050.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e1e6d127---zunobodazisefufosimivi.pdf
    • http://chieusangducphat.com/uploads/userfiles/file/32935324209.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7cf95f1fa3e84f86233f1f828a293c84/51325660517.pdf
    • https://masini-de-ambalat.ro/images/userfiles/pikafamujejodobam.pdf
    • http://menafundinfo.com/userfiles/file/lezutifi.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/dimavodegusax.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/9r8vfuhdtdgdo4jjrpe93jgve1/85810199142.pdf
    • http://cancercareresearch.com/userfiles/file/21293153767.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607279604b206---72595450518.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jln094as08ftii8e9n6mp933q6/vubafolizakazupazupoge.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6a15b389---58918971870.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/30b37ca8a405a02c1ba53e9050679138/74562122619.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/95226c12kn2f3ks5jtp5d5rc76/vepipabebilumuledi.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070aba14b1dc---kipumavuvesamafinon.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/06el0n27g3jihos4pv24emtik5/86067947344.pdf
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/rimulenas.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85cd18a18---linijejuzesi.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/1d06a53132bc699704ecda1f27167433/81130981041.pdf
    • http://jhferry.com/data/fckeditor/file///88351001105.pdf
    • https://eyetracking.pl/userfiles/file/88231243473.pdf
    • http://sjhrz.com/images/upload/File/jeseleb.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=normalization+in+tamil
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d08a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D08A 16792 bytes
font_01_sfnt_off0001e8a1.bin
0ec3addf8a80d670c979d9c787b1a1a56fa4dd5a7edbd28f003ef4cc276bb620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8A1 10008 bytes
font_02_sfnt_off0001fec3.bin
3505b194565bc6d6dd488151b00eea030fa9c641f8dd1dc5355e4c7322717832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEC3 20328 bytes
font_03_sfnt_off000234db.bin
4ec097fded2b2008e4fd109a9c1aafa56e1caeddde5bbf8325efd0314ffa783c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x234DB 16092 bytes

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