Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b14c87ebca44751…

MALICIOUS

PDF

69.8 KB Created: 2021-07-19 03:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3cad53a0db51823979fde9a3142e9a91 SHA-1: 13a45a370f957d16949799eff9b38516c4a1718b SHA-256: 4b14c87ebca447514efc6fc39d0fd77d6736dc61b777d3e783e1fe7c08e506b8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests a potential phishing or payload delivery mechanism. No scripts were extracted, but the PDF structure itself is flagged for suspicious properties.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6426

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/UkUWPC8UKDU/square?utm_term=coffee+table+minecraft
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e89a0f55f7654dec77b1ec/1625856527164/tongue_bite_while_eating_remedies.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f4b2758a396f1703ae0f53/1626649205584/weximajusotuve.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f1a8637ab7c5432f4979d9/1626450019500/vilanadalogalewewekabo.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_off0000b0ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EC 16792 bytes
font_01_sfnt_off0000c903.bin
e2724fc9fb20ab5045901bb4c0f0040b4a8f8b842fac2e2e02e2787752afb3b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC903 10500 bytes
font_02_sfnt_off0000e0df.bin
d7932e47fddfd4a710e897de2498a96784d35784312a60ca08ac41226230f6af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 16416 bytes

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