Malicious PDF — malware analysis report

Static analysis result for SHA-256 618c09438e13adb7…

MALICIOUS

PDF

81.3 KB Created: 2021-07-16 02:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 514bdda4af545c42ab4f3b785990b068 SHA-1: 16fe4f74fb08db7772b41f437356396e20035147 SHA-256: 618c09438e13adb75b01a9d2dfa95e997de109c2146cf732603b50c14cc9e068
66 Risk Score

Malware Insights

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

The ClamAV heuristic identified this PDF as a phishing trojan. While several URLs were extracted, they were all confirmed as benign. The document body was heavily obfuscated and truncated, preventing analysis of its specific content or intent. The primary indicators are the ClamAV detection and the presence of embedded URLs, suggesting a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1467

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/r_nBws6J8g8/square?utm_term=protein+sorting+pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e9235d563c1506a8b63bf4/1625891677908/perforated_bowel_sepsis.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee2c892af4c01978fbc3b3/1626221705727/solving_polynomials_by_factoring.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_off0000df8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 16792 bytes
font_01_sfnt_off0000f7a1.bin
f3a609f8a0914737fd54d786f630a0e1bd5a8f296460a5bdb00bd27a375fe36e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 16468 bytes
font_02_sfnt_off0001226e.bin
93f62a9dbd1838f75d29d5df304b9ba7b76d20f424ca552bbc8fefe09284f92e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 10468 bytes

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