Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ba648c96d219d2…

MALICIOUS

PDF

95.5 KB Created: 2021-07-16 06:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2898414dc2f069a18a22d8650c2048f4 SHA-1: c8ec299c2b190adb18154b744cf41d674b8db3a2 SHA-256: d3ba648c96d219d27ae8ec780099de8641f69fad5d25b74e5dbb32d191cc46ad
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, even those marked as benign, suggests an attempt to lure users to external resources. The PDF structure and heuristics point towards an exploit being used to execute code, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5781

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/um1bUVUAM38/square?utm_term=languages+in+curse+of+strahd
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f0d84393f2b3003809cc1b/1626396739900/padepiver.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ede60e36d51704236138bb/1626203662996/74949625818.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec83abef188817f7e168fa/1626112939495/sweet_noodle_pudding.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee812cfd66ff3739f24742/1626243372863/xamunarurazep.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_off000114c1.bin
c4d01adf819cc90e6c5bfd4c29f3eefda5bb7b1cb5935e8bc8f2fb0c12469f93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 10764 bytes
font_01_sfnt_off00012d46.bin
430611de233f39384076cce556bb1de75c551339683ed88ffdf5f4d780c08087		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D46 17124 bytes
font_02_sfnt_off00015a52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A52 16792 bytes

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