Malicious PDF — malware analysis report

Static analysis result for SHA-256 b370ceacf3ca8dfc…

MALICIOUS

PDF

125.3 KB Created: 2021-07-21 05:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 322ffc187c4ee2034bdb5a5bee5a3e03 SHA-1: f5be2c070e649163e6d014b36276bccc7c784431 SHA-256: b370ceacf3ca8dfcd40943ff780c0792bb39c11fa92c00c5abef1f055e2cda22
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, even those confirmed benign, suggests an attempt to lure the user to external resources. The file's structure and detection by ClamAV as a phishing trojan point towards a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6796

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/~3/9xivtwLAy4k/square?utm_term=basic+english+grammar+and+composition+for+junior+classes+answers
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f064c87865aa57457f8d8c/1626367177076/pdf_compress_without_losing_quality.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec81338300fd66e1960608/1626112307902/navadudeluwukazijeg.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edfa2ce83f616bcf85e5c6/1626208812586/woodwind_and_brass.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f7801c04504a567ce3915a/1626832924165/ximozafuxirisus.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee528186aa876280be0640/1626231425895/dibefutazu.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee036882b49873592df5a7/1626211176536/pisupesejo.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_off00017dbc.bin
d870f08e96ce7270d2a2ac0896ac5c8e840047e6f5fc52aaf61b560b11113950		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17DBC 21200 bytes
font_01_sfnt_off0001b60c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B60C 16792 bytes
font_02_sfnt_off0001ce23.bin
2e28cf7b358bfc78ef46bc974d5f5b28256da9628b027a7a9ac7f12f133a2b44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE23 11436 bytes

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