Malicious PDF — malware analysis report

Static analysis result for SHA-256 b427ff9dec9c841d…

MALICIOUS

PDF

77.6 KB Created: 2021-06-10 13:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 08887e00fbbf34898ff69cd83825b2ce SHA-1: 23b3eece79d90db09fa34022be4e007182845105 SHA-256: b427ff9dec9c841d507248794d528f59e3afdc872baba154e61f3b171a937719
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://zajinet.ru/123?utm_term=feelings+and+emotions+vocabulary+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386092/normal_606e123822dee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462056/normal_5fe35a2724de9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421210/normal_60b7fd9fda8d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_6049ced0bc7d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_601d14ec087b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374545/normal_60431db7e8bd9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/05642c8d-3d2f-4f63-8357-6c92037f0202/livro_como_trabalhar_para_um_idiota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe60b87-3e42-4381-ad91-a4a1c329c6f9/how_to_use_philips_5000_shaver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0921b69c-415d-4f49-8d55-7925bbfcae99/tojoxeruwesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6df56f5-c4eb-4f52-aa15-2ed43b45fba4/honda_eu2200i_recall_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e4c67b-82d8-4b42-92a8-14f248e59578/nevisumopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ab8db7a-4029-4315-b1f3-cf5513172f7b/how_many_ft3_in_m3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcfc3b33-68ba-4c76-a68e-4f89e361fae6/80523002258.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa36a05-e037-4769-8aba-5bc816cfc542/6987232248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53175ab6-25ad-4624-8dc2-65add0c0c56d/borojetexokexedodoxamida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/135abcd0-6a5b-4415-84c9-85a7ce21ddb8/como_hacer_un_archivo_en_celular_con_fotos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21cd4fb3-a686-484b-9e70-e787b34f5db5/bonulafufenorutixi.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_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 5768 bytes
SHA-256: e1b378e7ac0b4c1d5c161eaa8f27a110573f9a1d0ee2f31b920668ae94a67774
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 11080 bytes
SHA-256: 064ddcd5b124386afcbe8eeaf95e2271595a64f9e64c1f8cd6b8551f766790e1