Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf1aef6b0264458e…

MALICIOUS

PDF

76.0 KB Created: 2021-07-18 13:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c78c35d941dc68ecf8140de895c9f2b6 SHA-1: 972ade8a7ef24ac75f230a7585f7bf67e6498af3 SHA-256: bf1aef6b0264458ebcf895ffd46f75e510e7da7805adbc77d53ed84e3d7dcc91
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site or download a secondary payload. The PDF structure and embedded artifacts do not reveal specific malicious scripting, but the overall detection points to exploitation of a PDF vulnerability for initial execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7703

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/iXsW93xxTQA/square?utm_term=example+of+homogeneous+differential+equation
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8fcf0c91b61347ea2281a/1625881840356/3598538107.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec78bf760c9e2bcf41e68e/1626110144091/1822_charles_babbage.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60f34955860d895b48276da5/1626556757796/tomixogegameweb.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_off0000c71b.bin
731c21bf5c1e9f0c30db1477747e9421ee5a3a266dd15124326ec64dbf90769a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC71B 16496 bytes
font_01_sfnt_off0000f222.bin
51671b95f82161e14e787f00e2e3394602f7d604f50d0085b91959d513244ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 11276 bytes
font_02_sfnt_off00010be0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 16792 bytes

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