Malicious PDF — malware analysis report

Static analysis result for SHA-256 953a195602c1e91d…

MALICIOUS

PDF

115.4 KB Created: 2021-07-13 22:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cae38c445c38ea811495ea1b5f9bebc1 SHA-1: 5371cc61b7872090d51e30b1fb225133c9154642 SHA-256: 953a195602c1e91d2f398c8e9f8b8ebb27245de9d7deb0f85770724cca399f10
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall detection and embedded URI heuristic point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.1308

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://feedproxy.google.com/~r/sq/ugae/~3/EjZ5HCEZs_A/square?utm_term=deficient+in+a+sentence PDF link annotation
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8b8ef810a01599a422d65/1625864431936/what_does_sedentary_mean.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_off000167d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D1 16868 bytes
SHA-256: 8c0750050cf4484084a000c6fd63c5685523647279f7245e1bc726c4a2cb5731
font_01_sfnt_off000193c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001abd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABD7 10064 bytes
SHA-256: 6b0eb5bb3343060856b1fda84920ebfe6c0f3e4ea1b4c34610c1810873b1f2e7

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