Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd9520e6192c60d…

MALICIOUS

PDF

77.0 KB Created: 2021-07-18 17:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6fc706d0ab0c405d25fb541b872637a1 SHA-1: 2cb9d891b8172f996a777d588d1e794bd9435c77 SHA-256: dfd9520e6192c60d1fd815aef912b8c8ca140ffd22417d8d9685faad8e115bd5
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it is a password-protected archive lure, a common technique to bypass gateway security. While an external URI was extracted, it is marked as benign, and no scripts were found, limiting further analysis of the payload delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8957

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/iXsW93xxTQA/square?utm_term=online+wage+library
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee259fa005482cc154a4af/1626219935742/jukegororabip.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f2566a9dfa584dc9d4ff9d/1626494570645/pamitulibigixoto.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f1c5cf9111ba2895790984/1626457551560/boy_scout_swim_test_requirements.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f299f354c26a0cc3f3fe21/1626511859847/26657353990.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f14f459b6f2361195865bc/1626427206250/nelson_geography_8.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_off0000d00a.bin
8c753fb2ddc4e8261ac730434ab8a44845c5f33e1b9b27730a895c9fe2a6fc33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD00A 10260 bytes
font_01_sfnt_off0000e751.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 16792 bytes
font_02_sfnt_off0000ff63.bin
f3490bb7ef8253a592f21d5c646a9e18855b061f6318fec7be8d6a193ca05cfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 16312 bytes

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