Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44fd9fe342d0573…

MALICIOUS

PDF

77.0 KB Created: 2021-07-12 22:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b64a01b1820329a5438af981a78d8879 SHA-1: 9018f92288a35fc81294a801fc938391efeb403c SHA-256: a44fd9fe342d05739e3760c4cecd7efe90fdd12fe2ca6f3a19b24701eda36321
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The embedded URL, disguised as a legitimate document link, likely leads to a phishing or malware distribution site. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall context points to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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/-MXWpcYQ7kA/square?utm_term=cost+accounting+journal+entries+pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e7e78681471576eaed7251/1625810823289/kulefoxiguwagedolapivina.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e77d17020dc931794578b0/1625783575298/how_many_oz_is_a_fifth.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e885432d8eb734bed8ac09/1625851203569/88568186915.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e850c53e18c826700c0ea1/1625837765856/shaolin_temple_admission.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7cc80bab062161337b64b/1625803904116/how_to_manually_remove_viruses_from_your_computer.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e924b7f229ba2ea8371b11/1625892023351/durexikugalapevezoduxevu.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8a50e082d905bfad95b3c/1625859342619/fezemujupuxudakowugu.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_off0000c949.bin
59b96b7dff10b6c69c1be8b9b5bf2577ffe10009f39dec18011953615995e830		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC949 17112 bytes
font_01_sfnt_off0000f613.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 16792 bytes
font_02_sfnt_off00010e2a.bin
758d17f45da2d226312a494e8ec493e188a540d086dacbaf30a9213cd77fe3f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 11056 bytes

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