Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ad7495cc1145ea…

MALICIOUS

PDF

79.3 KB Created: 2021-03-30 03:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba80afa47c0c65d496ba3c60173afdfd SHA-1: 76d3032a6e656acb955afa392d65ebe2ce08a823 SHA-256: 23ad7495cc1145ea39e8cc842388c5ddd6008a60edc78970640c92f5268989e0
104 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL leading to a suspicious domain and a visual cue suggesting a download button, indicating a phishing lure. The presence of a PDF_URI heuristic further supports the phishing attempt by pointing to an external URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=jolly+phonics+satpin+worksheets+pdf
    • http://spindlndou.space/61529812823arcvc.pdf
    • https://static.s123-cdn-static.com/uploads/4530910/normal_6000863c30172.pdf
    • http://help-violation.com/zimigurikizevoredovusofei7pps.pdf
    • http://hookup682.site/vipomakorapabivbv24j.pdf
    • https://cdn-cms.f-static.net/uploads/4462059/normal_6025fab4aa5d8.pdf
    • https://cdn-cms.f-static.net/uploads/4375515/normal_5fe6cd2f07da8.pdf
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5fd177cf0fcfe.pdf
    • http://wwbook.org/jumpsuit_women_amazonypfwr.pdf
    • http://mon-cmso.best/gre_quantitative_reasoning_practice_questionsk55zy.pdf
    • https://cdn-cms.f-static.net/uploads/4448549/normal_602b673a5df2f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_b74af59a43eb44738290bc087a618ef2.pdf?index=true
    • http://fotiwovexa.epizy.com/vosusimawakufubunas.pdf
    • https://uploads.strikinglycdn.com/files/308442d9-219b-4a58-96b3-afe0c8d2f36b/what_does_beast_from_water_mean_in_lord_of_the_flies.pdf
    • https://e05bdd54-7536-4db1-b7ed-110d7b12163e.filesusr.com/ugd/dd5a80_077105f4edeb4097ba0967eb7601698d.pdf?index=true
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_059eef3f026841cba257e996a269cc5b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/215ef31f-0e50-4826-9f3a-9d9488066bdf/como_hacer_un_proyecto_de_investigacin.pdf
    • https://s3.amazonaws.com/degagaziv/virus_definition_symantec_endpoint_protection_11._0.pdf
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_e3e664fd3c434bf3a72a5986676ff39e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5e5e5d63-f456-4ad8-b435-3c51ca4b4e2a/982341143.pdf
    • https://s3.amazonaws.com/bidivo/android_messages_2._9_apk.pdf
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_8b4ad4f011da405fb36c61d19f2bf3d3.pdf?index=true
    • http://vujomigokije.rf.gd/56438897970.pdf
    • https://s3.amazonaws.com/vovuzize/ccleaner_full_keygen.pdf
    • 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_off0000f83e.bin
ef9cd8f4afdc64dc835ca685d4d033866450f9a565b93f6f52ee6f434ab31620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 5492 bytes
font_01_sfnt_off00010afe.bin
cb29a393083fa7653c1cb43c10271417d3beef5c12b81ac5d73041395f091af9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFE 10916 bytes

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