Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8ac2fe27cf999c…

MALICIOUS

PDF

79.1 KB Created: 2021-07-12 20:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3f5061985282df270c3281c5d8ee4dc3 SHA-1: 3881945713ef4a783ce5bb5a389dc39c1c9b9ef8 SHA-256: aa8ac2fe27cf999c62fc6193d3166931530e45b12bfdb8e44857e95cede3ccca
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as a phishing trojan. The presence of embedded URLs, although many are marked as benign, suggests an intent to redirect users to malicious content. The file's metadata indicates it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier clean score 0.1234

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://feedproxy.google.com/~r/sq/ugae/~3/IdU8rIDf9lQ/square?utm_term=who+sang+oh+baby+you+got+what+i+need PDF link annotation
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8c00aa7bae82fe89614e6/1625866250871/zagomatu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7c5820781e4bb11b26b3/1626111064382/powershell_log_off_all_users_except_current.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A2 10812 bytes
SHA-256: f72e9095c90f73dfa2ac0c23958e2d830b7f854c36b0703fc4d40bd42128b930
font_01_sfnt_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 15724 bytes
SHA-256: 387f23407c6650a28a8857234d4166c00a0f68ed2ebd9eeff9bf72da7d7a3431
font_02_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_03_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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