Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95f4e2b1851f55f…

MALICIOUS

PDF

87.7 KB Created: 2021-07-14 06:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0a7f692af9d8a0968b692433067f32c SHA-1: 7965588fc8dc5bfadf41948fd4f95994875da13a SHA-256: b95f4e2b1851f55f1cfd76994422737d36f770d2b3f51df92ddc8f1b922230f3
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. The presence of embedded URLs suggests an attempt to redirect the user to a potentially harmful external resource. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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://feedproxy.google.com/~r/razvivatel/yapz/~3/-MXWpcYQ7kA/square?utm_term=groups+of+words+in+english
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60edaa1dac23c31e62fe6ea1/1626188317831/92992270850.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec821add2ac847ff7e7941/1626112538884/one_hectare_in_square_meters.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee4e7e2d09e34b72a152fc/1626230399052/plagiarism_checker_for_malay_language.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8c9dc32416487af012c6/1626115229981/67493183186.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee27593753dc428c86c01e/1626220377608/previous_year_jee.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e867e2662f87799f2af90b/1625843682668/19229357223.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_off0000f68d.bin
738565ea6203dc816a63e55160cd521473534b8914f4d215719d7ccb8aac547c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF68D 16924 bytes
font_01_sfnt_off0001225b.bin
7cba75d201448b9f4334fd6bd8fa028c7978f62015d6283e4d2b162d9bde90d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 10740 bytes
font_02_sfnt_off00013aca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACA 16792 bytes

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