Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b530caa537c9e5f…

MALICIOUS

PDF

58.1 KB Created: 2020-11-10 19:20:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f873074e300af56e61ec3659c309721 SHA-1: da15f0efe0e56ed158946c100fcd9f73a3e75961 SHA-256: 9b530caa537c9e5fd62086ca2aee9c6786ac259534c8dbe08d00b52b0dc4378a
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan behavior. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or credential harvesting scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?keyword=frontosa+fish+how+big
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/4064917.pdf
    • https://rofibefis.weebly.com/uploads/1/3/4/1/134131293/2876921.pdf
    • https://worofinuwur.weebly.com/uploads/1/3/4/5/134582463/9132708.pdf
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5f92794e9a76e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fosagobomap/42575829281.pdf
    • https://uploads.strikinglycdn.com/files/f0aaabeb-a489-4377-8014-45c5df368d83/xotazabigadapez.pdf
    • https://s3.amazonaws.com/nazekisigiduz/rawelomasosulurisobi.pdf
    • https://uploads.strikinglycdn.com/files/3340dfd6-a34f-47a5-862c-a3831069f483/bafifugotu.pdf
    • https://uploads.strikinglycdn.com/files/e50786ba-528a-4b99-827c-49c93c21be99/62535358710.pdf
    • https://uploads.strikinglycdn.com/files/a8db023d-8bde-42d9-878c-2f8c0d5d25aa/peasants_quest_trailer.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_off0000aabe.bin
953250ad0ec9c788a30bb908b5972329b68803431b1aa47003abdd4bf295426a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAABE 5184 bytes
font_01_sfnt_off0000bc75.bin
450632c32f176e294c5f9661283e124a4a1ebc1c2eb69e686ffbc367e7aab6fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC75 9360 bytes

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