Malicious PDF — malware analysis report

Static analysis result for SHA-256 a613d958e10e629b…

MALICIOUS

PDF

83.2 KB Created: 2021-07-20 08:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 58dfc15785807b0b86c1934ae4db4355 SHA-1: fe70598888f73402026cf8ceaf079cd526c4ba47 SHA-256: a613d958e10e629b06a1c5bfd4b4c2125c4a21df71273db16251fb183f692af0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The presence of embedded URLs, though many are confirmed benign, suggests an attempt to lure users to external sites. The wkhtmltopdf authoring application and the duplicate object body heuristic suggest potential obfuscation or exploitation techniques within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5817

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/RVI1sXQGPkU/square?utm_term=how+long+does+it+take+for+a+point+to+get+off+your+record
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60efddf296309e3685a946d4/1626332658721/word_to_background_problem.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0ba316c706f161d8350ad/1626389042226/management_and_leadership_theories.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f4db53ec5ad00cc0a1eef6/1626659667248/great_old_hymns.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f01fe31e1a563dfb8f564c/1626349539352/zakalejumuxuwu.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_off0000e0b8.bin
7d21548402a0b1da0b0a030fbb5e3737a090a3a31da6a90cfc35e2f12f173959		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 17356 bytes
font_01_sfnt_off00010e6e.bin
b3fa9c78625eeb1dab203b346468d9b75df30781452670451e1b36dd1128a8f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 11176 bytes
font_02_sfnt_off00012891.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 16792 bytes

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