Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c18299b266e27f1…

MALICIOUS

PDF

80.0 KB Created: 2021-07-17 06:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1aeaf7e218be020e95069b5f48d83b1e SHA-1: 4b480a41f8f856101ad186dbcdf78e68fe84139c SHA-256: 4c18299b266e27f16c59a7196f9579091d69385d5c39766fb5500102d923a97f
96 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 a phishing trojan. The presence of external URIs, although marked as benign, suggests an attempt to redirect the user to malicious content. The overall structure and detection indicate a malicious intent, likely to deliver a secondary payload or lead the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8571

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/razvivatel/yapz/~3/pL_UGxDroB4/square?utm_term=cash+and+carry+meridian
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ec879ddbb514329faf8fea/1626113949778/business_english_students_book.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0bc095142327a873b84c9/1626389513355/triangle_congruence_by_asa_and_aas.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f1ed740700880084589dc6/1626467701033/90807950731.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60f0f1625d599800102c4763/1626403170978/degoriwepogupanar.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e7704dcba01e017d441bce/1625780301218/buvejusilotakanibu.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60eda064f53e3457ef871dea/1626185829025/probability_and_statistics_ebook.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_off0000d634.bin
f55aedf08482fc6a6350efa9917bc22474763c21a993c1822beb136e67bacca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 10516 bytes
font_01_sfnt_off0000eded.bin
450b379cacc125cff324ac2b0ec78157a94e77dd16fa3272c22014b779233939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 17448 bytes
font_02_sfnt_off00011bf1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF1 16792 bytes

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