Malicious PDF — malware analysis report

Static analysis result for SHA-256 605bf6b584791e33…

MALICIOUS

PDF

76.3 KB Created: 2021-07-20 01:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c5e8d413d182f749b5b8e114d05fe64 SHA-1: 2f1973702f0f1161e600b13c0498fcaa64761891 SHA-256: 605bf6b584791e33106964dacad690a550e2c21cfb935b489bc21d154340d1aa
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to external resources. The PDF structure and heuristic firings point towards an exploit or phishing attempt, likely leading to the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7483

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/S-4CHg4Qmwo/square?utm_term=fixed+cost+construction+contract
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f5fbe9e7a840178c3f4633/1626733545604/xozunupo.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8ae770d7388251f4f2fd8/1625861751205/nursery_rhymes_the_ants_go_marching.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7e29c8b0d544b6d70b41/1626111530287/jopoletawidepipipovuk.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f5f2e14ce737406a361a47/1626731233508/the_kingfish_grill.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_off0000cb29.bin
880a414d49118eddc7d1ef4f29f398823899eae8aba96a4c15f08c2b24fd7495		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 16440 bytes
font_01_sfnt_off0000f5a3.bin
f0898cb968fd8acb8dd19d7cb09b66d891f3fc41d4cd16d1a895cebc574ab229		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 10496 bytes
font_02_sfnt_off00010da4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 16792 bytes

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