Malicious PDF — malware analysis report

Static analysis result for SHA-256 4253a1dd9540774c…

MALICIOUS

PDF

105.4 KB Created: 2021-07-20 01:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6e9e7271d7bceaa6a31d5ecc12ca544 SHA-1: c817c961be814353c1b01fc455ef6601c63eb31d SHA-256: 4253a1dd9540774c0262a72516a5f2f6657d3d5a2c6b8d14a5ccb2c2c58da8b9
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it is an advance-fee scam lure. The document body was heavily obfuscated and truncated, preventing detailed analysis of its specific content or any embedded scripts. However, the presence of scam-related language and external URLs suggests a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5608

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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/ZFaGRQ6RLlg/square?utm_term=flipped+classroom+examples
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f5807c70ff22042a1e917e/1626701948567/dwell_on_your_regrets.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f5f4e53e24907808525e0e/1626731749788/asp_net_developer_interview_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f471051d350707422a3ba9/1626632453774/a_graph_of_x_against_y.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_off000139a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139A5 16792 bytes
font_01_sfnt_off000151bc.bin
005fc77b7219d869f13de3e70c185cc087da66457357aaccbcf38a84e2f8258e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151BC 10552 bytes
font_02_sfnt_off000169be.bin
a044a8e53cde21247e761817bbcbd407122d8703efea6ab472b5984c002dd4a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169BE 18820 bytes

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