Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca89a899468dd9c9…

MALICIOUS

PDF

76.7 KB Created: 2021-07-13 01:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f934a6fec525c535a9c3c3364a041580 SHA-1: baa55ccee3c8cb901883eaa923cba81a69284531 SHA-256: ca89a899468dd9c9ec1f96055e3eff213b561afd9d1a787c7234d2639666f5b0
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, despite some being benign, suggests a potential phishing or trojan delivery mechanism. The PDF structure and embedded artifacts do not reveal specific scripting languages, but the overall context points towards a malicious document, likely delivered via spearphishing.

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/qI_NY8u86tA/square?utm_term=what+is+glazing+on+a+window
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ecb7abfd8bf72f7b957adc/1626126251798/city_sightseeing_coupons.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecb4c83c961a3b2c5ab90d/1626125512177/electrical_technology_volume_2_by_theraja.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ecb59910fbb85b140d0dc6/1626125721619/26300702176.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60eca0b2e0c99b3eb2d546e0/1626120370373/rasezagujapebuvit.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecb71e58bd604bb8742f03/1626126110161/41162264370.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_off0000ccde.bin
d1907ef3dda1c11cff91b2e2e79ed17f7cc2003542cb3a2c647bc912164f95fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCDE 16400 bytes
font_01_sfnt_off0000f776.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 16792 bytes
font_02_sfnt_off00010f8d.bin
b0973e3d4d737582c0b7df5de73989686979edddd757ce1594f6d591ee81bb0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8D 10432 bytes

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