Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91a8c6cf3a3109a…

MALICIOUS

PDF

81.0 KB Created: 2021-03-09 14:05:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 76ca6c8f14bf821f88c483ae48827d2a SHA-1: e4d9edd6309533d06639e0cfa631b72351831ad2 SHA-256: a91a8c6cf3a3109a6ee2eef58a1bb5691add3cda157ab3c33b194156739bb4a2
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for an external URI pointing to 'kuzutuzo.ru', which is likely a phishing lure for the book '50 Sombras de Grey'. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/wix?keyword=descargar+libro+50+sombras+de+grey PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393179/normal_5fef600e7f202.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/hp_laserjet_2055dn_toner.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368951/normal_5fdd8c6d48f85.pdfIn PDF document text
    • https://nunatazireru.weebly.com/uploads/1/3/4/6/134698050/9925160.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369324/normal_5fe3ec12d6078.pdfIn PDF document text
    • https://puxezemugip.weebly.com/uploads/1/3/4/3/134311794/konuj_xobusu_xogerurif_sebiwuj.pdfIn PDF document text
    • https://soxupewo.weebly.com/uploads/1/3/4/3/134392520/gadajugire-vovosutatu-rarinotopanila-sutakozinod.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/can_you_wash_pellon_interfacing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487935/normal_5ff03c0dd78af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417405/normal_5fe57b797e49c.pdfIn PDF document text
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/riwexefexugofofipaxa.pdfIn PDF document text
    • http://tixaman.scienceontheweb.net/xatesatonat.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/xupovobejanam/luzanokifosamugowixuri.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/94513581583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/374afca1-9437-465a-9395-243514edae0f/zusoneleb.pdfIn PDF document text
    • https://aed0ee3a-d217-4696-a563-de9ff15d6c37.filesusr.com/ugd/f80e3f_984c68c7efb7437487431b6f70fa0778.pdf?index=trueIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_a67921ef5ec440e6a0609012aff06b3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3eda5c-0a07-472b-bfd0-0aa06d86fb5f/38321955688.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/reflexive_pronouns_exercises_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd0254a-6e8c-4717-966d-68fee2556c45/kenmore_600_series_gas_dryer_not_getting_hot.pdfIn PDF document text
    • https://67bb8873-ca08-4da4-87c0-60a8072ebff6.filesusr.com/ugd/a838c0_e92ece1c29a24b4b88de731b07fcea8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e66a9f-f09d-490f-baa4-546f435062ba/tabla_peridica_elementos_metales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df674707-34f6-4d08-8a95-d3795597a972/what_size_tires_are_on_a_chevy_traverse.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_off0000fb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7C 5768 bytes
SHA-256: d178aa1a3159f4c966451e069f5f06c1a9fccd787096408d85b8f254da12b8f6
font_01_sfnt_off00010f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 11916 bytes
SHA-256: 300474a7621db2f8d499762f0cbe43215d3edb7c6c1d94da89fb4ed39dd5a62b

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