Malicious PDF — malware analysis report

Static analysis result for SHA-256 affc4dcfe0098732…

MALICIOUS

PDF

76.9 KB Created: 2021-07-17 14:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 09805beb5b38d575f74fab77e238863e SHA-1: c28bbf8b97127466dcc78f2e464b276226800ca3 SHA-256: affc4dcfe00987323f87eabeb7ef080b9e25b6dadf2c39a44f6f02cf810fc1dc
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ClamAV heuristic identified this PDF as 'Pdf.Phishing.Trojan', indicating a malicious intent. The presence of embedded URLs, even those initially flagged as benign, suggests an attempt to redirect users. The file's metadata indicates it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs. While no scripts were explicitly extracted, the nature of the detection and the embedded URLs point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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/CcIy6vlvkUk/square?utm_term=knowledge+in+english
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e958772210ba6bce13b639/1625905271592/simple_calculator_in_android_source_code.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f1ff1f7561a248fec4d275/1626472223268/usps_first_class_package_limits.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_off0000ce22.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE22 16792 bytes
font_01_sfnt_off0000e634.bin
f7d6d3aa8ba634e09e56113538289418b45571f7be0a12c0c181f721bec53fb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 16116 bytes
font_02_sfnt_off00010fff.bin
c66ddb4252ca3235f247286e763ed19a239e9a87a1dc2e982820a17e9ab38bb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 10244 bytes

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