Malicious PDF — malware analysis report

Static analysis result for SHA-256 903a49d4b51ee328…

MALICIOUS

PDF

77.3 KB Created: 2021-07-17 02:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c414cf9dd197ae396e0bd8c8ae059412 SHA-1: 3f6ad9849b4f3beb58da6e968fa1d274bf7b3ccb SHA-256: 903a49d4b51ee3283ff52807951b6fb47f29e2fbe222477b24478a15c6c9b2cb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of an embedded URI pointing to a suspicious URL suggests an attempt to redirect the user to a malicious site. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users, likely through a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7746

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/~3/5VO7y1TeAqQ/square?utm_term=mbbs+help+dams+notes
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ed9335f2de0a6ebf354834/1626182453466/kivofosulumanokux.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60eca42236ee212f66d186d7/1626121250161/easy_pub_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e9476f37da2614570f65f5/1625900911113/average_life_expectancy_by_country.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8e4e5085b1c120f94907e/1625875685880/class_10th_maths_exercise_2.3_question_number_1.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_off0000cdaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAF 16792 bytes
font_01_sfnt_off0000e5c6.bin
c101a3b6924f69c04565a6193fd49cc88f60f9f37531e81a0fbafe897a8149d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 10596 bytes
font_02_sfnt_off0000fd93.bin
3795dad24976de30c31c0c09b8ab01ea5000d37fbd9ce370cbe5c76d6407392b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 16360 bytes

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