Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a36ebb535fa734…

MALICIOUS

PDF

75.3 KB Created: 2021-07-13 22:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f14ce5949dbd5e17709ba52d7462e023 SHA-1: f4383f3a01685d46479a930af3c72b4f09cfb9b1 SHA-256: e1a36ebb535fa734c9f24ccc587e163f1486ce308b623f1c9869bfcc6b01b5cf
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it is a phishing trojan. It contains embedded URLs, one of which is disguised as a link to information about playing Fortnite on a Chromebook, a common lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect the user to potentially malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.1538

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/r_nBws6J8g8/square?utm_term=how+to+play+fortnite+on+chromebook
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edbb1f546515375baceabf/1626192671765/benefits_of_running_a_mile_everyday.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_off0000c5b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B0 16792 bytes
font_01_sfnt_off0000ddc2.bin
1739f9a885741d1d0a3351e283e9cab0e8c4600b9e8d56cf76fbdca165daff2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 16400 bytes
font_02_sfnt_off0001085b.bin
74b8012ccaa85ab3e1f2de9fa68f9cd2b84bc0b28838f5df3bde5b824cca76e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 11000 bytes

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