Malicious PDF — malware analysis report

Static analysis result for SHA-256 318579a641d26f22…

MALICIOUS

PDF

75.0 KB Created: 2021-07-14 06:38:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbaf1f0af585c959bace0a70fb84e5fc SHA-1: dd53ad16501d09345cffdeefb5f9aec9eccc25fe SHA-256: 318579a641d26f22c6956633d65eb9f1de6fc4ba3074699e853a2d721023e55a
96 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The presence of embedded URLs, despite some being marked benign, suggests an attempt to lure the user to malicious content or phishing sites. The file's structure and heuristic firings point towards an exploit being used to execute further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/sq/ugae/~3/4Ji06Fp1PxY/square?utm_term=at+a+canter
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec84738bb04542cee4a033/1626113139570/tight_sphincter_muscles_anxiety.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec7d14ff9c8b53cea1ca41/1626111252450/91770118206.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8f430563c1506a8b423aa/1625879601072/words_that_have_x_in_them.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec91c1f83a7f26ecd1b2d4/1626116545981/buxineromunilabenojob.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e924dce6a58043b691c17d/1625892060727/jesus_jesus_jesus_there_is_no_other_name_by_frank_edward.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ee3a0d115d504d3a85fc34/1626225165862/zapekasubun.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee10e79b1e4d6a3609a7b8/1626214631207/nudosolugugunegejegu.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_off0000cb09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 16792 bytes
font_01_sfnt_off0000e31b.bin
5f5b513e9c5582af706e67fcf40715c8ba09a4604c913d502143eee49fe54934		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 15600 bytes
font_02_sfnt_off00010b06.bin
9cd2328c9f630ae13c9e850d29cd3ef55acc1d7e4b3711318cc4ee477f96d8cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B06 9776 bytes

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