Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd16be0140c4662…

MALICIOUS

PDF

77.1 KB Created: 2021-07-19 00:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1e126563e6a952483f061426e05ba17 SHA-1: 87936b29b5be4b7c08da0eb72e7655b8ac79d55d SHA-256: ecd16be0140c46620ea3d0cc4ccecf27e2509d7ef04d30ee416c67e386e12cc9
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware delivery attempt. The presence of embedded URLs, though currently flagged as benign, suggests an attempt to redirect the user to malicious content. No scripts were extracted, but the PDF structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7604

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/v-xubMviL4Y/square?utm_term=print+to+pdf+android+app
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f433ba9c7c9f0ea9a284b8/1626616762284/84517599630.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f26cbc26e2e727c257ed6f/1626500284744/lawn_and_garden.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec8f72e7718717d762e539/1626115954145/22192171499.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_off0000cea9.bin
8d808596a3ce53ca5fa138bb8d95fd646344604b493255f1087d517ec834f055		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA9 10148 bytes
font_01_sfnt_off0000e561.bin
ca615d648d8921ef4578c2ab23dd96ac4361765a8c7c037b4b4ebc7d91297396		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE561 16832 bytes
font_02_sfnt_off00011126.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11126 16792 bytes

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