Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc9b61447dd9900…

MALICIOUS

PDF

104.5 KB Created: 2021-07-18 20:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54b309cd0ce5e724bc7e053790a8a15d SHA-1: 6fd0c757b0b59ae4acaf61271150849d25cfcc5a SHA-256: 7dc9b61447dd9900dbe0fbd98214bdf0c2e7d65bb8fdfdfbf6816b72d0b8d4b5
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, even those confirmed benign, suggests an attempt to lure users to external resources. The file's structure and detection as a 'Phishing.Trojan' point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5608

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/razvivatel/yapz/~3/iXsW93xxTQA/square?utm_term=the+doctrine+of+deification+in+the+greek+patristic+tradition
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f14115db86a67d858368fe/1626423573306/linux_for_beginners_by_jason_cannon.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8ff0bc6eee4b058f29c5/1626116080755/severe_hypokinesis_of_the_inferior_wall.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec77cf154eb17b6848da1b/1626109903858/gk_questions_in_telugu_download.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_off00012bf8.bin
bc1ec0753ae41f61f248c7dbb16b328d46c7bab17222b0d23b6d697506e77a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF8 23712 bytes
font_01_sfnt_off000164ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164AC 16792 bytes
font_02_sfnt_off00017cc3.bin
6e530336089d3642c126b2d0ba3a574070158da96ae337d822a947ca6374c74a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17CC3 10908 bytes

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