Malicious PDF — malware analysis report

Static analysis result for SHA-256 316bcfde72b1de88…

MALICIOUS

PDF

76.5 KB Created: 2021-07-16 05:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de56f7721763e374e9d49498b0ad7758 SHA-1: b5a101d8460f0a1009d4ee1beb50e2f79c3c59bc SHA-256: 316bcfde72b1de882fb6c1569b9661ceb937707660e54a2e19002e454caf0bd0
66 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan, indicating malicious intent. It contains multiple embedded URLs, some of which point to external resources. The PDF structure and the presence of external URIs suggest an attempt to lure the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier clean score 0.2210

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/W5vEtEh6t-A/square?utm_term=1+st+conditional
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec82e454a52c186ce4f3bd/1626112740789/pipe_separated_csv.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ecaab6c426b81e83039a67/1626122934682/later_stage_venture_capital.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_off0000ccd9.bin
4fdacbdaa13b3f668a8a468fde0671a2eb0f15593c2e606433876cf2bed6bd04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 16648 bytes
font_01_sfnt_off0000f82a.bin
4908328ed2aa3a6cedaeaddd7167cece81f9d2e8f44d35c4f13d634893e08787		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 10088 bytes
font_02_sfnt_off00010ec5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 16792 bytes

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