Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fa0c0ec85ef410…

MALICIOUS

PDF

78.2 KB Created: 2021-07-14 04:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d36524c412c8f6fd893e2331f978269 SHA-1: aab4164e438872d854dedda030c7479f341e40b0 SHA-256: 54fa0c0ec85ef41083abbd9f685745f9fdfa41d9b044c4d9b2cc83f5bca82396
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. An external URI, https://inwebjor.ru/square?utm_term=pc+game+tester+online, was extracted, suggesting the document's purpose is to redirect users to a potentially malicious site. The authoring application 'wkhtmltopdf' and the presence of embedded fonts do not directly indicate malicious intent but are common in PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://inwebjor.ru/square?utm_term=pc+game+tester+online
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edacd2c7772f26c8526aa7/1626189010898/idd_country_code_852.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ecfcc60318596fdcbe182d/1626143942499/pdf_converter_software_for_windows_7_free_download.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e9321fb68d8f0f4bf8d19f/1625895455637/fuzisopakekojuminagale.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60eca3029c874e71424af874/1626120962957/window_shopping_meaning_in_tamil.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ecb1bff9fdfb3a2d2f6a06/1626124735933/partial_syndactyly_toes.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed0b6ab1b13d3c3c0d1481/1626147690481/excel_to_exe.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ec7f98b6dedd3ae1684944/1626111896975/lalefofetoxapisozenaxuz.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60edf21bad58ca03d228e21a/1626206747728/doxedizibazatefadazugina.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e7a46adbb92d34f5abb4cc/1625793642367/64257049835.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_off0000d1ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 16792 bytes
font_01_sfnt_off0000e9bf.bin
5a45b3088ee6b4acb1a0030ff95b8397b6d71e30f0ef2363df119c6548277e70
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BF 16636 bytes
font_02_sfnt_off00011501.bin
15cd5251133f5cea79c75358045bf23812e0f54d8eed856400bbb2039e52673c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11501 10572 bytes