Malicious PDF — malware analysis report

Static analysis result for SHA-256 b22c0df9eacfa80c…

MALICIOUS

PDF

82.4 KB Created: 2021-07-15 16:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab584bd2f481d053bbd8b02afb8a54ac SHA-1: 6aa5c3f606e4827fcfe2a70e784c3ad0534f5546 SHA-256: b22c0df9eacfa80c4b26eadc492cfd86b68cfa2bd031128c950a8b44878f24bc
96 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. ClamAV specifically identified it as a 'Pdf.Phishing.Trojan'. While no scripts were extracted, the presence of embedded URLs and the overall detection suggest it is likely used to deliver a malicious payload or redirect users to a phishing site. The file's structure also indicates potential exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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/iCUEKX862tE/square?utm_term=cbse+9th+science+textbook+exercise+answers
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8eda5338e9546e47a5e5/1626115805585/spiderman_games_for_pc_free_download_full_version.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e85249402b2441d1316142/1625838153553/gepojimi.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edb846a73a263c31e30f1d/1626191942109/comprehension_passages_with_objective_type_questions.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ee20392ee8b51fd9332708/1626218553998/rolling_stone_100_greatest_singers_of_all_time.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e84bdc0770ad4d9ffa2b28/1625836508892/baby_x_bottle_warmer_how_to_use.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_off0000df47.bin
bc3438f1d4b548b7302beaaea97599b7c884afbbba0431241cf010bc9ede1d50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 10900 bytes
font_01_sfnt_off0000f8a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A1 16792 bytes
font_02_sfnt_off000110b3.bin
a5229caf915da2501ebe4f6f49b8bdbe2948848967c880cc273d59ef3f20e9df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 17164 bytes

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