Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb37d3f8d13346aa…

MALICIOUS

PDF

81.6 KB Created: 2021-07-18 00:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8eb31b5b24c1b8facef8953296396b27 SHA-1: f45bc5c8c40f815492a80a4f32d298e75876dc80 SHA-256: fb37d3f8d13346aa2d7401b0d4cc5f1d05cac368b74fe8e38155eeade0ea6655
66 Risk Score

Malware Insights

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

The ClamAV heuristic identified this PDF as 'Pdf.Phishing.Trojan', indicating a malicious intent. The presence of embedded URLs, though many are marked as benign, suggests a potential lure or redirection mechanism. The file's structure and the heuristic firings point towards an exploit being used to execute a payload, likely for phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.1467

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/CcIy6vlvkUk/square?utm_term=when+was+how+do+i+love+thee+written
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee64267dee9f188f7aea10/1626235943106/epstein_barr_and_pots_syndrome.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f002f2d77757041653d409/1626342130509/75012265327.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00f.bin
5d6e58a588e6fc419742629d89d3b9c1953e9ce852c59097f3ae1297e7fe214b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 16644 bytes
font_01_sfnt_off00010af0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF0 16792 bytes
font_02_sfnt_off00012307.bin
6d8e3c8cce5b0459cc59f560d011b8f67d06c378bb1b5633b4e294f950395cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12307 10492 bytes

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