Malicious PDF — malware analysis report

Static analysis result for SHA-256 634259efd0c3c07b…

MALICIOUS

PDF

75.2 KB Created: 2021-07-16 00:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 607b45cfda96812991444e6d827ba440 SHA-1: a058f246fe498b940e86525b4cdc411cdab5d29d SHA-256: 634259efd0c3c07baf941b6d1e6c4e2f9a422d15cb026f7c7b2f8999addb4018
96 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV confirming it as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site or download a secondary payload. The document body is heavily obfuscated and unreadable, indicating an attempt to conceal its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

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/iXsW93xxTQA/square?utm_term=degrees+to+radians+maze+worksheet+answers
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee02a1ad58ca03d22aae2d/1626210977964/xewabuzemesebadobexinidu.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e7d446ed7e63043963cd8c/1625805894925/skeletal_system_diagram_easy_to_draw.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0922c6cc2533e4dff0f7d/1626378796856/find_the_perimeter_of_a_rectangle_calculator.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e90c03b630645a0ef692b4/1625885699671/the_alchemist_test_answers.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_off0000c411.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC411 16792 bytes
font_01_sfnt_off0000dc23.bin
89b543472d0c0d443f4255e5364eb0de89f65df5f75d3379237cdd26a87e7e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 16968 bytes
font_02_sfnt_off00010834.bin
38d8f9dba69e2704dd6cc15f6aa9ab493452356b16ead420ba52b1f430f2bbbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 10888 bytes

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