Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b701f9b36e43b73…

MALICIOUS

PDF

79.2 KB Created: 2021-07-15 17:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0da5d77c6a67ac1136908a53e52d6f3f SHA-1: dc4a258094eea5fde4be741b740330a89f63d3c7 SHA-256: 7b701f9b36e43b73ce60dcc5c6b0a51a880faf1413b649ab8ec616e1ae201a06
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://inwebjor.ru/square?utm_term=halo+3+odst+mcc', which is likely used to redirect the user to a phishing or malware distribution site. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8621

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=halo+3+odst+mcc
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0132d16a6d35a1113a5e3/1626346285246/wuxotepojojesujasagorewos.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ed49610318596fdcc1b815/1626163553109/mba_dual_specialization_in_finance_and_marketing.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e857f0f785342ef887ee86/1625839600880/m_fakhry_davids.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7a6b9b977dd1475c6f708/1625794233571/14753980563.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7888288cf71862a86ff7/1626110089066/indian_contract_act_1872_in_tamil.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_off0000d2f3.bin
30ea87042fc39bf9f68c57f589d5d520d8afd57dc28631bdbddec972a350475a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F3 10268 bytes
font_01_sfnt_off0000ea18.bin
93daad49bec4b989de596d7fd180bfdd69e531486db9fe053772426d6edeb068		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 17512 bytes
font_02_sfnt_off000117fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117FA 16792 bytes

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