Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e367fb2e5d8b27…

MALICIOUS

PDF

87.1 KB Created: 2021-07-12 23:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 837577d7bda6fc0024d36a1a5d18c832 SHA-1: 6235a0b16456f8dc0e4230b870fb1a1b8ddf7e95 SHA-256: f6e367fb2e5d8b275cfc1e3dabb093ce79c95db418a6e477fc2d16555d37e4be
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan. The presence of embedded URLs, although marked as benign in this analysis, suggests an attempt to redirect the user to malicious content. The PDF structure also shows duplicate object bodies, which can be used to hide malicious content or exploits. The overall evidence points to a phishing or trojan delivery mechanism via a PDF attachment.

Machine Learning

  • Nyx PDF Classifier clean score 0.1532

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/qI_NY8u86tA/square?utm_term=glacial+rift+of+the+frost+giant+jarl PDF link annotation
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec9ec9934d360eb28ad98a/1626119881925/sirejezamufofixixagunuz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 16964 bytes
SHA-256: 6125ccfbc3b6ffadf871d725327ebd6aab263976b10af966cfa0e6d87a73402f
font_01_sfnt_off00012021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13838 10784 bytes
SHA-256: 5b42b006449e73a3a1c4ecf61e461df8bb32e37ed7cd469e2f2f3ff449e546f6

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