Malicious PDF — malware analysis report

Static analysis result for SHA-256 5237e4c96d89ef53…

MALICIOUS

PDF

74.5 KB Created: 2021-07-14 02:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 36b3eb5f46b688a10bd3f3a4bf58a7b0 SHA-1: d48b82947e2da165e21622d4490bb0ecde93b38b SHA-256: 5237e4c96d89ef539077dcbb16f59256f501975ee2c36fb3d1aecd29b154fe46
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI, even if currently flagged as benign, suggests a potential phishing or redirection vector. The PDF structure and embedded artifacts do not reveal specific scripting, but the overall detection points to a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/cEZ-xJcQpFE/square?utm_term=granulomatous+inflammation+causes
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e92ea4b673687559683d9b/1625894565101/first_grade_review_worksheets.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edf705ba7c7f743c1fea45/1626208005181/3969260168.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edfd5a36d5170423637a13/1626209626882/southern_pines_womens_health.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7efc7e5cd11affcca9f0/1626111740561/6808468273.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e7c4c052059f1ec1e30b8a/1625801920479/encyclopedia_of_homeopathy_free_download.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ee086ea005482cc151feac/1626212462553/velekalomorigusedutemavuk.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8e88c37da2614570b2b6d/1625876620777/meaning_of_shog.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_off0000c625.bin
ac98928949a665de6665d234d2af3e8960221b2ed180021483f7b6e87e508513		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 10636 bytes
font_01_sfnt_off0000de7b.bin
e447823685295024b31e79a9173d1d731dc45be4e6d887d446b4b0975b15a07a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 15384 bytes
font_02_sfnt_off00010618.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10618 16792 bytes

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