Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7ac02a867f30a1…

MALICIOUS

PDF

106.8 KB Created: 2021-07-15 23:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0934ddf20a65f94e9d5f038de7e9fe38 SHA-1: 8e933ab79f7537f81bfbabd73801bd3995423a5b SHA-256: 1f7ac02a867f30a1865b4257f60f1a117d4845b4dd1722ba267ab6c59cc6c61f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. The SE_INVOICE_LURE heuristic suggests a phishing pretext. While no scripts were extracted, the PDF structure and heuristics indicate a malicious intent, likely to lead the user to a malicious URL for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7738

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/eoPDrVzwpx0/square?utm_term=a+to+z+synonyms+and+antonyms+pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee1ebabb85ab7f02ba9ead/1626218170676/31705333405.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e9602358c6623f0384341c/1625907235778/10730043473.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60effb0438a0fc3ca968472d/1626340100367/how_can_you_download_fortnite_on_your_phone.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee175264675e3b9dde5363/1626216274724/78988363102.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e76b2cd5c0eb2e2200b75f/1625778989012/just_cleaning_this_gun.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_off000141dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141DD 16792 bytes
font_01_sfnt_off000159f4.bin
fede8c38a63627bc6413a827451e563711097e1f61a99688aaa573eccc985e3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159F4 10444 bytes
font_02_sfnt_off000171b6.bin
6876ad98a46f91311ddf55ec627ec4c37676b0062fcb339b5b33ee8336ecc478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171B6 17460 bytes

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