Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa59e56bdc2bc8f6…

MALICIOUS

PDF

86.3 KB Created: 2021-07-19 12:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 062e310fd37dcccb3c24b234d4bf3547 SHA-1: 1dd4af10a8d7b2682c99a1a1944fc2589f870bed SHA-256: aa59e56bdc2bc8f602ff3066bbfbaae00d5420a30724b82b9dcdf2d64be1028e
66 Risk Score

Malware Insights

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

The ClamAV heuristic identified this PDF as a phishing trojan. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to lure the user to malicious content or download further stages. The PDF structure itself contains duplicate objects, which can sometimes be used to obfuscate malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier clean score 0.1542

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/X6hrLWyzjlw/square?utm_term=stages+of+marriage+funny
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f1ced48994bb5083d4c118/1626459860636/lobefozuzukivavit.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f407193a33e4096de2a0c8/1626605337605/the_lunar_chronicles_order.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_off0000f271.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 16792 bytes
font_01_sfnt_off00010a83.bin
46d241c086422f4427efcfcc1d2a6b55bc5573dfabd4f2219e5186f92cb980df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 16024 bytes
font_02_sfnt_off0001337e.bin
41015e8a87b3e44a3c3a74d2fe0f14596eda0ecc0f7f5f4bde125eb4e602e02a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1337E 10800 bytes

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