Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2da5dc834d3791…

MALICIOUS

PDF

81.6 KB Created: 2021-07-21 03:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 269cdd3884e95a02d12cec6fe9390497 SHA-1: 4ec19c304b153f1746763e26f79807dea361d235 SHA-256: bf2da5dc834d3791901375154331888d8d3300bfa4998ace3f0e3d19e7547690
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. The document contains an embedded URL pointing to 'inwebjor.ru', which is likely a phishing or malware distribution site. The PDF structure itself contains duplicate object definitions, which is a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6221

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://inwebjor.ru/square?utm_term=free+ebook+cover+maker
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f182ff9b6f2361195ab0b8/1626440447144/jofosuvutoxuf.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec9f6fe0c99b3eb2d51833/1626120047951/exponential_function_equation_with_two_points.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee67014d490f672754b688/1626236673378/how_many_decks_of_cards_for_golf.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_off0000debd.bin
dea9f4059f49d47d025849fe098a075dccb76f1c2008b807f688e22153b12182		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 17368 bytes
font_01_sfnt_off00010beb.bin
64a645b091f4ab750d767e1b2ce37bf98a34e3379e2180547d09930b7b86c048		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 10160 bytes
font_02_sfnt_off000122b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122B0 16792 bytes

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