Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11d76850575e301…

MALICIOUS

PDF

75.8 KB Created: 2021-07-14 05:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d72646905b2aba1b0d3eabc89f78dbb1 SHA-1: 44015e4e61bce59a14e126f2997f6af4ff556ca8 SHA-256: c11d76850575e301ee9e5bae263563d80d4ac185fbc3f8f0d6c00a6008fe793f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The presence of embedded URLs, despite some being marked as benign, suggests a phishing or credential harvesting attempt. The PDF structure and embedded artifacts are consistent with malware delivery, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8872

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/HbdJGeoIq_s/square?utm_term=how+to+answer+why+do+you+want+to+volunteer+here
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e855a16d3b0f067e345350/1625839009832/my_hdl_cholesterol_is_low.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec7a0220781e4bb11ae563/1626110466536/17349372934.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edbbad84e8e33d4875df30/1626192813407/91094071387.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee2bdf462f394a1e40e00d/1626221535392/insufflation_meaning_in_marathi.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec8708de8c3264fe5f4dc1/1626113800289/zulekilizibit.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_off0000c848.bin
955a619023db3c5d3b3940d7fef99c5c5744be1ea6788d90d5c8a0e849d9aa1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC848 16428 bytes
font_01_sfnt_off0000f2d5.bin
93ea9b349bc069fcf4241aa414a9598e06b990a2a92f35b35f645724b52f196f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 10608 bytes
font_02_sfnt_off00010b16.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 16792 bytes

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