Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95003f83d00e3f0…

MALICIOUS

PDF

78.3 KB Created: 2021-07-16 03:40:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d545e1d63483bc51c25057c5c22a6ab2 SHA-1: 8e57199de839f665115db7f3307b09db67ad56ec SHA-256: f95003f83d00e3f065ed9d58b98c9fa0e24cdcb148c9c8caa5d31fa9b2e63d01
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains embedded URLs, one of which is flagged as external, suggesting a potential phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack vector, likely spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8287

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/um1bUVUAM38/square?utm_term=to+be+confused+about
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7aeb49ebc0053f3142909/1625796276833/chicago_manual_of_style_17th_edition_citation_machine.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed3ce60124a666ff41d965/1626160359082/61335135022.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e889fc8c671153b553e83a/1625852412800/botany_objective_questions.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60edea8de55429721e2255bb/1626204813190/fuxefekavosa.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60e8e592cc7c08645923cc9a/1625875858382/war_of_1812_crossword_puzzle_answers.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e810108f757b1ac453a09f/1625821200919/tanofidatubik.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_off0000c964.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC964 16792 bytes
font_01_sfnt_off0000e17b.bin
7ed795d62057c803f98ff4ccf40c7f61c2af26f395f42a09658b5dc2dfddf282		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 10436 bytes
font_02_sfnt_off0000f956.bin
921f55be065d254f09f1b8aad5e043c1ae175a9a38488acfc70448fa3409c4d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 21268 bytes

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