Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a274d939a8a7255…

MALICIOUS

PDF

121.0 KB Created: 2020-12-11 06:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b24be5ca6856bb3bfb831aba8a140404 SHA-1: 7b809ff6f8ab0994bb1b3a63324444a9c8756ea1 SHA-256: 8a274d939a8a72559e6e44b8ef9a04b737ecc83567b037d34e64e8cad4e1cb0c
96 Risk Score

Malware Insights

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

The PDF file contains a URL that is likely used for phishing or to download a secondary payload. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, references 'Chinese anime series' and the authoring application suggests it was generated programmatically, likely to obscure its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/aws?utm_term=chinese+anime+series PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386605/normal_5f8caf43e47f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_5fa938ea2f322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5f87d0155f3ab.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/46320601-8de2-43ad-954b-d0a670979edc/zenajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d214544-1672-4438-b2d4-18cc87d4a529/39833802344.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/publisher_bookmark_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1cb10df-7448-4942-bc3c-fb0466b23a58/28205490955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbfc634a-0114-435b-b165-8554580f8a25/statistical_studies_statistical_investigations_margin_of_error.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/11527911233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3caa99f-11c9-4d9f-b508-a80147b2c58d/68036740293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09190c6-dfd9-4956-b790-ba220af578d5/too_young_to_be_a_dad_full_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/925cef89-dfda-403c-a887-95bca9bc5b01/denamarin_advanced_for_large_dogs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e822a83-74a3-4ce5-a3a0-adc552e99714/curso_de_electronica_cekit_completo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001a626.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1A626 27168 bytes
SHA-256: 9e37df45904d81c20ad7d90a0e7d878224e84a0f3199d706095647b6bd0bb4ea
font_00_sfnt_off00013b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B30 16252 bytes
SHA-256: 8d57be95961d90e1f055302f445629cea1976d59c3624c667d52cf9664870fb0
font_01_sfnt_off00016ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EC4 4800 bytes
SHA-256: d2f5386a354259e45f23b506f8c3c9dbc6a31b7f6392d568a9b643644d71cf5d
font_02_sfnt_off00017ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EDE 11876 bytes
SHA-256: f0390eb6f34fb4f13f8230ba5df4f6c4c466fe91bb12a416502cd5c4666262c6

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