Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0fa439f3c3988b…

MALICIOUS

PDF

76.9 KB Created: 2021-07-17 02:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 27a77027b7d7f0c48719dff22842a01d SHA-1: 786dc90a2f461704572718aefc8a1ff3cd9e4af6 SHA-256: ed0fa439f3c3988b7216d0880ad9c7c0830c700bb224fbc2b71a2755f98fa691
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan, indicating malicious intent. The presence of embedded URLs, although currently classified as benign, suggests a potential delivery mechanism for further malicious payloads. The PDF structure itself contains anomalies like duplicate object bodies, which can sometimes be used to hide malicious code.

Machine Learning

  • Nyx PDF Classifier clean score 0.1538

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/razvivatel/yapz/~3/kVSxLQpkboc/square?utm_term=wifi+driver+for+802.11+n
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60eddd7f3be50f2c5dad7c97/1626201471899/auspicious_time_for_baby_birth.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_off0000caaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 16792 bytes
font_01_sfnt_off0000e2bc.bin
af9b004a8261a544296c1ca612ecfbaf8980d77bba94c19e6c482b31d7bf98bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 17560 bytes
font_02_sfnt_off0001102f.bin
142a7808e348cb68fb7c599dbc9a55fef7dbbfa244d423d26406f9816bed38d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 10500 bytes

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