Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98ddc214e75cf7a…

MALICIOUS

PDF

74.0 KB Created: 2021-06-08 08:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 486c15b85b766e8efd35e2ebf8c273c2 SHA-1: e3564ffa9cd01e753460a672e86505bb8325ca9c SHA-256: c98ddc214e75cf7a7e912f93e3f17318ca85647c519c89138ddbb5ec79bc8ca2
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URL, https://jumiwimov.ru/123?utm_term=baidu+browser+free++for+windows+7, likely serves as a lure to a phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to exploit users through social engineering.

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://jumiwimov.ru/123?utm_term=baidu+browser+free++for+windows+7 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403685/normal_5ffbf2a5b8259.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474448/normal_5ff6d58c37d3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405195/normal_5fd7981a95434.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5ffef3a49c2d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389090/normal_6035ea512f404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406820/normal_603e79d1542bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485153/normal_603c8a8b9bea8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378160/normal_5fff70673a650.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/0b36e877-82ca-4765-bd7b-c3512bd89227/canon_p23-dh_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467f1d76-567e-4b35-8b60-c3b28b5a5130/the_chronicles_of_narnia_prince_caspian_book_summary.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/f/9660065909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91cc2d5-bb14-416a-996f-8c0260c979d2/how_big_is_apex_legends_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b271160e-3330-4100-bb43-be87f1f21a81/74642266038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7b3d948-d0da-42c8-8662-4178f5e3a91a/redetedobojulakafoluvim.pdfIn PDF document text
    • http://xibosini.pbworks.com/f/15.1_the_periodic_table_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c247fb23-5e39-40a2-b7a0-92fbc0c020d5/70122194671.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_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 5232 bytes
SHA-256: 83cd6813855e601767f208a325610008b127626b60800f180423e821f4370ab5
font_01_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 10376 bytes
SHA-256: 357634d4478ffa78c32d5d4c0fe8ed706af9e09d8daee0b54b3632a5d0c52188

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