Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7f81e6b2f2e19a…

MALICIOUS

PDF

76.1 KB Created: 2021-07-13 23:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6679bc9353b3077d918658a0c7317983 SHA-1: 91d9f86d673b41e3de4fbb6c6ca68ed405ffaacd SHA-256: 7f7f81e6b2f2e19a3fb9d076f23cec0c480241a5bba4b64ab512dac20d8ae291
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, though marked as benign, suggests a potential phishing or credential harvesting attempt. The PDF structure itself is suspicious due to duplicate object bodies, and the ML classifier output strongly supports a malicious verdict. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9125

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/rCno-htTzZk/square?utm_term=cbse+physical+education+book+for+class+12+pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e79e4081471576eae9548f/1625792064506/6314718701.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8c456eebddd6e48ed4124/1625867350508/soromadazomeg.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eda922c2b60e0ed5b5f09e/1626188066850/libuduv.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed94c57c55557fb27c7d1b/1626182853442/in_the_madding_crowd.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8f0600cbdad4d3503ce5f/1625878624487/my_in_swahili.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_off0000c4f8.bin
9420c5ffa7b80512e16b08d46d682d767b807c991f0cfe916b22dafb67c0596c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F8 11364 bytes
font_01_sfnt_off0000dfa1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 16792 bytes
font_02_sfnt_off0000f7b3.bin
c94fd44c1223e009627178e7468d83fff4e45eeb050c8c75d5571c4d8e4044e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B3 17096 bytes

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