Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2f27e204ac7524…

MALICIOUS

PDF

77.5 KB Created: 2021-07-16 10:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c32ad22cdf993bd24eba6e3e02db4295 SHA-1: 95c8ea0676be7d9cfb77b6ee66fd6676b382d4a8 SHA-256: da2f27e204ac7524b9950c0596b1efcbb704722f6649a41b78fd9e25511bba04
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. An external URI, 'https://infrive.ru/square?utm_term=function+of+adjectival+phrase', was extracted, suggesting the document's purpose is to redirect the user to a potentially harmful website. No scripts were extracted, but the PDF structure and embedded URI point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8897

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://infrive.ru/square?utm_term=function+of+adjectival+phrase
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f049369b141e594ca3489d/1626360118348/haters_be_like_quotes.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee1f635f7927514e3aed1d/1626218339376/kenufefo.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ec8468c3fb560d26f2f9d0/1626113128556/how_to_get_easy_anti_cheat_for_fortnite.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f0ca1f0dcda21ba0940233/1626393120093/independent_and_independent_variable.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec98e880388a1034d8fd44/1626118376200/what_grade_do_you_start_middle_school.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e9540b0cbdad4d35075a2f/1625904139904/reading_and_comprehension_worksheets_for_grade_3.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_off0000cecf.bin
532e155710bbf214efe31c0c17516ec3cb094933e25964da0e5bb1b90c0a8d54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCECF 10992 bytes
font_01_sfnt_off0000e836.bin
0c7651df10e3563d7bfdf04fc5f2ae5263f74d2a8db9b3a8c68ec619db127e11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 16260 bytes
font_02_sfnt_off00011216.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11216 16792 bytes

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