Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef1912b4ceb95c6…

MALICIOUS

PDF

81.4 KB Created: 2021-07-18 01:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e77be8500d8192a0ffbcfb5a5a52c0f SHA-1: 48bd574be4b5e396d4f23c2e12a6a3bdf131bc74 SHA-256: 4ef1912b4ceb95c64ea9775190a5a2d870ec2ec9d2a00b8217db0f4145ff8abd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains an embedded URL that, while currently flagged as benign, is indicative of a phishing attempt. The PDF structure itself is unusual, generated by wkhtmltopdf, and contains obfuscated content, suggesting an attempt to conceal malicious activity.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3811

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/jEScUJLm1bs/square?utm_term=cha+cha+to+the+left
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e96719309bd63f3d880fb3/1625909017728/36685330068.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edfa5aa50f6e33a327711f/1626208858293/97978081474.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f314e8c4d0d61e6734e87d/1626543336427/fufusezituzugibedugad.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1d6.bin
c4657346b16bc393bb429ec3cf318b9d60e161ea33b7de7e01b6b72365d24b96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D6 10000 bytes
font_01_sfnt_off0000e83b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 16792 bytes
font_02_sfnt_off00010048.bin
780f5e4d8c7267208a427271da89927e6b591ca1fccac36503f17b153e61347c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 1764 bytes
font_03_sfnt_off0001089e.bin
30b6a5834190918c9451bd012b6f2a4335374b8fc294e6c8a3a2187816795fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 19108 bytes

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