Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c957d6efedd5e4…

MALICIOUS

PDF

75.3 KB Created: 2021-07-19 02:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d0bb42338cc6b517bc3ee9488adbec8 SHA-1: 35049d3274b730ed2782c96bc4a927b898d5fb66 SHA-256: 31c957d6efedd5e4dd5fdbf302133fbef8fd4dfea1f47c0a177e1238f14a1156
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded URIs, suggesting it may be used to redirect users to malicious sites or download further payloads. The presence of PDF_URI and EMBEDDED_URL heuristics points to the exploitation of PDF vulnerabilities or social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/WVKuihPcy9U/square?utm_term=free+download+of+books+in+pdf+format
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ed03c6840a1961e7b1b2fb/1626145734515/topis.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e925958fb24157da7037c0/1625892245336/10410907293.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7934d9ebc0053f3126bae/1625789262189/dizumokeziker.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f089dca1e0111420a39030/1626376668194/sample_answers_for_behavioral_interview_questions.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f03d7cbf9aec2111b24948/1626357116397/dafusefodifipajo.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec80a35978cb5ccaaa910a/1626112163572/81110158187.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e8b3c9eed2fb3579bdaa0f/1625863113378/39837322823.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_off0000c861.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC861 16792 bytes
font_01_sfnt_off0000e073.bin
5ef6f0504b99b6e2cb128972b4cd75c0d9d1e78786bc4c94bcbee44bef2d4446		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE073 15472 bytes
font_02_sfnt_off0001080f.bin
a9a56e9f4f13dd3ddf2df39c8f09a17c1dcc0759bf7c4973e29d9237b2c0e472		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 10952 bytes

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