Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c4c8790692ef9c…

MALICIOUS

PDF

75.8 KB Created: 2021-07-16 14:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28cbd1e5d86ae0341a622c90dd99b894 SHA-1: 12de6e8557e4aa337006c40c8af2b63c65b0d534 SHA-256: d0c4c8790692ef9c9736bd0cd5cc2a274510c82a901aac5da4e5f61f026f1dcc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of embedded URLs, combined with the ML classifier's high confidence, suggests this PDF is designed to lure users into downloading malicious content or visiting phishing sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern indicates a malicious intent to exploit the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7483

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/S-4CHg4Qmwo/square?utm_term=gta+vice+city+download+for+windows+7+pc
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f03eecb37dc55b0353a205/1626357484751/advocacy_meaning_in_marathi.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e937b12210ba6bce12e75f/1625896881595/chatrapathi_audio_songs_downloading.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f00be324fa75375d857f4e/1626344419336/gizobuvaxelurozuma.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f07da61fd42f24c9260703/1626373542438/foxeseju.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_off0000c6f3.bin
c998970fe024dfe6d95ea5d94672c1c607b588f7dbcd540cf07894de4d3df4f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 16480 bytes
font_01_sfnt_off0000f167.bin
061323d0334eddb1110041a6c263f68f3803bc4067138c778a5133cb89a0789b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF167 10968 bytes
font_02_sfnt_off00010b2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 16792 bytes

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