Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1fb62b89ea809d…

MALICIOUS

PDF

76.1 KB Created: 2021-07-19 20:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95991483d77b3668fb8b32487d9020aa SHA-1: 4497dc15198b07c679b7f4d1527cfdc83c2952d8 SHA-256: cb1fb62b89ea809d636898527d1d659c2c15abba3268f52c33ab5b7fa8b40a5f
104 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of external URIs and a heuristic indicating a visual download button suggests a lure to trick users into downloading further malicious content. The file's structure also shows duplicate object bodies, which can be used to obfuscate malicious content within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8791

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/~3/4aHNpQc2m6I/square?utm_term=little+man+2006+full+movie+download+480p
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f23682e13ee97666fc9a41/1626486402838/thermo_neslab_rte_7_manual.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec708cb6dedd3ae166f3c1/1626108044706/simple_cake_frosting.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f57f99aba5f52989c2f6a0/1626701721117/the_secret_book_free_download_in_tamil.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f3903b70ff22042a07c05a/1626574907881/fear_of_a_duck_watching_you.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f4a3679c7c9f0ea9a8dbfa/1626645351799/kexemolebewizavixorilukal.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_off0000c88e.bin
023a89f3d65b9a68012d036a5444c58d64f17e96b9a5123503cc560d0a36542a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC88E 11296 bytes
font_01_sfnt_off0000e32f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 16792 bytes
font_02_sfnt_off0000fb41.bin
a6297ad5b322404ce48a1798e19cb3e19d1a63b749f80f6a349f028c0527112b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 16052 bytes

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