Malicious PDF — malware analysis report

Static analysis result for SHA-256 20cf5ff629363631…

MALICIOUS

PDF

80.8 KB Created: 2021-07-12 20:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 835e62b2eee17b795d88c5325c041a44 SHA-1: 735916418dc0238f2f2a10f2d774592302049bd3 SHA-256: 20cf5ff629363631b974236c362317ed5976b6a72860bd734b9013690eaabf82
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded URL that is flagged by heuristics. While the URL itself is marked as benign, the ClamAV detection and ML classifier indicate malicious intent. The PDF structure also shows signs of manipulation with duplicate object bodies, suggesting an attempt to evade detection. The primary attack vector appears to be directing the user to a potentially malicious external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5793

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/v-xubMviL4Y/square?utm_term=words+that+starts+with+az
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e940dcb68d8f0f4bf94ec1/1625899229058/79792407715.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e936f5b9b95949b65f72d4/1625896693255/diary_of_a_madman_and_other_stories_lu_xun.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e961963ba7d954d547ff95/1625907606362/xukosutetexufevid.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e864491cdec93718076ce5/1625842761423/taxes_and_government_spending_worksheet_answers.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_off0000de42.bin
d365d795cbb82af347f5c5546810994c06bea71eb6c29ca22ac5c71128b299ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 10200 bytes
font_01_sfnt_off0000f55a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 16792 bytes
font_02_sfnt_off00010d6c.bin
f50b48fd62b3ecf10ab94cc239988a84d41717aab5ec5a561994c537a49ca9d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 16408 bytes

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