Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c19a52f5f06fe4…

MALICIOUS

PDF

73.3 KB Created: 2021-07-17 06:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 883847130295f9c11b9d8c9670fc37ad SHA-1: 40f67b168c62bc02f37db3d68b7722ab614225e5 SHA-256: 97c19a52f5f06fe42dc22c1d798af8a38b2579624f2ffca906f97f50209166ad
96 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, although many are marked as benign, suggests a potential phishing or credential harvesting attempt. The PDF structure and the wkhtmltopdf authoring application are consistent with exploit delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6193

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/k6oGaauGqGM/square?utm_term=sync+outlook+calendar+with+google+android
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f2487d7f94c710fbbac558/1626491005991/89830275984.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f068847865aa57457fefa3/1626368132410/solving_systems_by_elimination_answer_key.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e9415e8fb24157da71208f/1625899358341/understanding_polynomial_expressions_worksheet.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e908253f195e1e40355d3b/1625884709120/ropurofatubujaxawuzowili.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_off0000bc7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7D 16792 bytes
font_01_sfnt_off0000d494.bin
55e0852c181dc3f63e8fb045715112a4265bcdcba4d32059cca7745ac93191bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 10948 bytes
font_02_sfnt_off0000edc7.bin
009784e241141c8ffb368b3685b74a9905cad405cef487615c4bb96368f7d6e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 16692 bytes

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