Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea193ba6fc19c683…

MALICIOUS

PDF

83.1 KB Created: 2021-07-13 21:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73a89e23c257009e67f047c6efd517a1 SHA-1: afe76a1588201b7c258191cd44bce91524cf8981 SHA-256: ea193ba6fc19c6837216c2385a35cd2a7a659121d3e5fd0df232da9ba1bc1f1e
96 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. 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 appears to be malformed or intentionally obfuscated, contributing to the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8584

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/iCUEKX862tE/square?utm_term=c+programming+aptitude+questions+and+answers
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ecacec7f78e10bf03e4d48/1626123500501/5th_grade_parts_of_a_seed.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e89d8a02864774f65265f2/1625857418561/sukone.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edc9d94485e42169ffb2df/1626196441419/double_vowel_sounds_examples.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e95ca312fb7d0b279521b5/1625906339380/zikeretojipirejad.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60edc3bcc450ee47307bd06a/1626194876196/pick_up_lines_for_girls_in_spanish.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e800649ebc0053f317f9d6/1625817188209/pioneer_sound_system_manual.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed85efbc85f73bac28e663/1626179055637/93317578485.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_off0000dc21.bin
9620db102bc9e707692b8cf27eea880d42855fda6ae1e8d8e8a41614506e2071		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 11052 bytes
font_01_sfnt_off0000f566.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 16792 bytes
font_02_sfnt_off00010d78.bin
e1b33d67c952dbe0e647b3f13f6521be8ceb70a2eee4fbadb722b4326a8ab143		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D78 18332 bytes

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