Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c536cb8cd20bc13…

MALICIOUS

PDF

75.7 KB Created: 2021-07-16 07:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1291a060af122c8142e18132d11e590 SHA-1: c1cd2573aab1fad32483769083dcbe207bc82fb2 SHA-256: 6c536cb8cd20bc138067498ccccd360daa6b475884858807acc72e18764a9dc6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple security heuristics and an ML classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The presence of embedded URLs, although many are confirmed benign, suggests an attempt to lure users to external resources. No scripts were extracted, but the overall detection profile points to a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8907

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/razvivatel/yapz/~3/kVSxLQpkboc/square?utm_term=pdf+to+word+converter+for+large+files
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f0e4a25d599800102b76b9/1626399906825/kixemivox.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ecc4e4688cba50b673752b/1626129637036/repananugamofenijop.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f04a111b851e16b33feb08/1626360338135/dafudekupuwo.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee607b86aa876280bee491/1626235003407/rate_of_change_problems_with_solutions.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e94483e51f1f218d6b1910/1625900163912/growing_roses_with_potatoes.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8cdd3b009f83b0755f23a/1625869780037/wutudexixisep.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_off0000c78d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 16792 bytes
font_01_sfnt_off0000df9f.bin
4e986301b5c90f20f2f93ab6b5f31a818b510f76f76f1bd5c777cc1f1672d6b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 16420 bytes
font_02_sfnt_off00010a09.bin
fc5040891337e2b3b0b510f4b8bb1fc0eda4d9afc02d3db09117008adc0df6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A09 10804 bytes

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