Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d71aab04cca2803…

MALICIOUS

PDF

76.0 KB Created: 2021-07-13 01:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f01aa2a5ac6a680c98594cc96a8847a SHA-1: a83163ae038fcc5d79019a31156eafe621b7cce0 SHA-256: 4d71aab04cca28036462192de652037a6c0cf67974eaff0160b0d2067a17cd47
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 phishing or trojan payload. It contains embedded URLs that point to seemingly benign content, but the overall structure and detection suggest a malicious intent. No scripts were extracted, but the PDF structure itself is suspicious.

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/-MXWpcYQ7kA/square?utm_term=is+height+a+recessive+gene
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ecb5fe635fe735bd7f28ba/1626125822776/additional_floor_to_a_house.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e942e937cb90447560fd22/1625899754099/sunnydale_holiday_park.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e8f40fe6a58043b68f8baa/1625879567696/57387139335.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecb5fc4d4a7853b715e807/1626125820774/cbse_class_12_physics_alternating_current_notes.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eca92d7d354a5e86a68e45/1626122541884/wowukam.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_off0000cb11.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB11 16792 bytes
font_01_sfnt_off0000e328.bin
8f76ccc4e6166e9ff556f559c23bc67e2e8028c91382b1480a1ef57d0255e74c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 10360 bytes
font_02_sfnt_off0000fa92.bin
29e6cb684bad1d8211f77eac387ee79e39f2079707a32848c2ae4a710cb3093b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 16096 bytes

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